Meiō incident
The Meiō incident, or Meiō coup, was a coup d'état that occurred in the fourth month of Meiō 2. Hosokawa Masamoto was the primary instigator, alongside Hino Tomiko and. Late in the month, Masamoto raised troops in Kyoto and deposed Ashikaga Yoshiki, installing Ashikaga Yoshitō as his successor. Although the coup was initially successful, Yoshiki escaped from house arrest in Kyoto and established himself in Etchū Province. Masamoto failed to decisively defeat him again, effectively splitting Japan between two rival governments. Although Masamoto successfully prevented Yoshiki from deposing Yoshitō, he faced internal opposition from the Awa branch of the Hosokawa clan, especially after he attempted to adopt an heir from outside the clan. In 1507, Masamoto was assassinated, and Yoshiki deposed Yoshitō the following year.
The primary cause of the Meiō incident was that Yoshiki continued fighting military campaigns despite Masamoto's objections, particularly his campaign against in Kawachi Province. The aim of the campaign was the reunification of the Hatakeyama clan under Hatakeyama Masanaga, which Masamoto opposed because the Hatakeyama clan was the most powerful rival to the Hosokawa clan for the position of kanrei. In addition, Yoshiki had begun to rely more on other daimyo, including Masamoto's rival, with the intention of reducing his dependency on Masamoto.
The coup and the subsequent conflict heavily reduced the shogunate's power over the daimyo, as it was forced to rely on the support of powerful clans. The Hosokawa clan was divided into two warring factions for twenty years after Masamoto's death, while the Ōuchi clan under Ōuchi Yoshioki reached the height of its influence, effectively controlling the foreign policy of Japan. In addition, the 2=将軍家 was subsequently divided into those descended from Yoshitō and those descended from Yoshiki.
Background
In the Ōnin War, Yoshiki supported his father Ashikaga Yoshimi, who was the commander of the Western Army. After the conflict, the Western Army was weakened, and the pair took refuge with Toki Shigeyori in Mino Province. Yoshiki's cousin, shogun Ashikaga Yoshihisa, led a military expedition to Ōmi Province in order to subjugate the Rokkaku clan, led by, during which he unexpectedly died of an illness on 26 March, 1489.With his father, Yoshiki went to Kyoto to claim the title of shogun. Many people, including the former shogun Ashikaga Yoshimasa and kanrei Hosokawa Masamoto disapproved of him, and instead supported the claim of Seikō, the son of Yoshiki and Yoshihisa's cousin Ashikaga Masatomo, who was horigoe kubō. However, Yoshiki's aunt, Hino Tomiko, supported him, and when Yoshimasa died in the first month of Entoku 2, it was agreed that he would become shogun on the condition that Yoshimi became a monk. As Yoshimasa's wife and Yoshihisa's mother, Tomiko had been married into the shogunal family for nearly 40 years, and occasionally handled governmental affairs in the shogun's stead. Due to the fact that she represented the shogunal family, her support significantly helped Yoshiki become shogun, and she was the person who informed the Imperial Court of his succession.
The new shogun was also opposed by Ise Sadamune, who resigned as head of the mandokoro on 27th day of the fourth month. Although Sadamune had Tomiko's trust, as he had been a close aide of Yoshihisa since Yoshihisa was a young child and had devoted himself to the former shogun's upbringing, his father,, had lost favor after advising Yoshimasa to have Yoshimi killed for Yoshihisa's sake during the.
Despite supporting Yoshiki, Tomiko unexpectedly decided to transfer to Seikō in order to curb the excesses of Yoshiki and Yoshimi, who had suddenly risen to power. Yoshimi was enraged when he found out that Seikō was to inherit the residence, which was a symbol of the shogun, and demolished Ogawa palace and seized the land in the fifth month, without permission from Tomiko. Because of this, Tomiko rebelled against Yoshimi and distanced herself from Yoshiki, even after Yoshimi's death.
Afterwards, on the 26th day of the eighth month, Yoshiki and Seikō met in person and reconciled. This was due to the efforts of Masamoto and Ashizu Toshiyori, who agreed with Masamoto's intentions.
On the fifth day of the seventh month, Yoshiki was officially appointed shogun by the Imperial Court while Yoshimi was granted the rank of Quasi-, and it was believed that the father-son duo would remain in power. But Yoshimi developed boils in the eleventh month and died on the seventh day of the first month of Entoku 3 after treatment proved ineffective. For Yoshiki, his death was a severe blow, as Yoshimi, who had accumulated political experience while commanding the Western Army during the Ōnin War, was a reliable ally. Yoshiki was subsequently forced to think of a way to solidify his political situation on his own. After consulting with his close retainers, he decided to subjugate powerful daimyo to increase his authority.
Subjugation of Ōmi and Kawachi
Yoshiki continued policies of Yoshihisa, and responded to provincial uprisings in Tanba, Yamashiro, and other provinces in the Kinai region by ordering an attack on Rokkaku Yukitaka in Ōmi Province and strengthening the military. Many daimyo, including the Hosokawa clan, participated in the expedition, successfully overwhelming Yukitaka and driving him to Kōka and then Ise Province. At the same time, because Masamoto opposed the expedition and Masamoto's general was defeated by the Rokkaku army, Yoshiki began to rely more on other daimyo.In the first month of Meiō 2, at the request of the former kanrei Hatakeyama Masanaga, Yoshiki issued an order to attack Hatakeyama Motoie in Kawachi Province and once again called for the daimyo to provide troops. During the Ōnin War, Masanaga had fought with his cousin Yoshinari over the family succession, dividing the Hatakeyama clan into two warring families, the Sōshū, led by Yoshinari, and the Oshū, led by Masanaga. Masanaga continued to fight with Motoie after Yoshinari's death. Yoshiki responded by accepting Masanaga's appeal for a dispatch of troops, in order to both settle the succession question in Masanaga's favor and reduce his dependence on Masamoto. The daimyo who had had been ordered to do so then gathered their forces en masse in the capital, but Masamoto did not send troops.
Like with the Rokkaku campaign, Masamoto was opposed to this campaign. The Hatakeyama and Hosokawa clans both had the right to become kanrei, and Masamoto benefitted from the division of the Hatakeyama clan, as it reduced their power. For that reason, Masamoto's father Katsumoto had intervened in the succession dispute during the Ōnin War, and reduced the Hatakeyama's power by supporting Masanaga in his fight with Yoshinari. But Yoshiki's Kawachi campaign would reunite the Hatakeyama clan under Masanaga, and the reinvigorated Hatakeyama would once again have the ability to threaten the Hosokawa.
Eventually, Yoshiki overcame Masamoto's opposition, and on the 15th day of the second month of Meiō 2, the expedition was marched from Kyōto to Kawachi Province. Yoshiki entered on the 24th, and set up his headquarters there. The daimyo also surrounded and besieged, where Hatakeyama Motoie had established himself. As a result, smaller castles that supported Motoie surrendered one by one, and he was forced into isolation by the third month. Victory for Yoshiki and Masanaga had seemingly become imminent.
But Masamoto colluded with Motoie to prevent the reunification of the Hatakeyama. Masamoto had already been in contact with Motoie's retainers just prior to the start of the Kawachi campaign, and Motoie's chief vassal reportedly boasted on Meiō 2, 23rd of the 2nd month that "even if the shogun comes to assault us, this wouldn't even be an issue. That is because Ise Sadamune and all the other daimyo have already reached an agreement with us." Starting with Ise Sadamune, who had started growing dissatisfied with Yoshiki, Masamoto aligned himself with daimyo such as, as well as Tomiko, and steadily worked out a plan of insurrection.
The coup
On the night of the 22nd day of the fourth month, Masamoto raised an army. He immediately ushered Seikō to Yushoken, and sent soldiers to the residences of Yoshiki's staff. In addition to these residences, the temples where Yoshiki's younger siblings had been sent were raided and destroyed by the army on the 23rd. According to contemporary records, Tomiko, being midaidokoro of Yoshimasa, assumed direct command and had Masamoto take control of the capital.Masamoto attempted to handle the situation by declaring that he was going to depose Yoshiki and support Seikō as shogun, and that Masanaga was relieved of his duties as shugo of Kawachi. On the 28th day of the fourth month, he had Seikō return to secular life and take the name Yoshitō, supporting him as the 11th shogun.
Yoshiki and the various daimyo, as well as the shogun's followers, were taken by surprise. When forged documents containing orders to obey the new shogun were sent from Ise Sadamune to Yoshiki's daimyo and servants, most of them returned to 16 days later Kyoto from Kawachi on the 27th day. They then assembled under Yoshitō, while none of the daimyo supported Yoshiki except for Hatakeyama Masanaga.
Immediately following Masamoto's actions, it was rumored that Akamatsu Masanori was supporting Yoshiki instead of Masamoto, as he had proactively cooperated in the recent Rokkaku campaign and had an intimate connection with Yoshiki. But because Masanori had married Masamoto's sister Tōshōin prior to Masamoto raising his troops, he ultimately decided to align himself with Masamoto.
Ōuchi Yoshioki, the son of Ōuchi Masahiro, who was the shugo of Suō and Nagato Provinces, also aligned himself with Masamoto. On the first day of the intercalary fourth month, Yoshioki's sister in Kyoto was abducted by subordinates of. It is possible that, in order to prevent Masahiro from conspiring with Yoshiki, Masamoto and Motonobu took his daughter as a hostage to force him to consent to the coup.
However, even as the daimyo returned to their provinces, Yoshiki still had 8,000 of Masanaga's soldiers, who remained in high spirits and were prepared to fight to the death. On the third day of the intercalary fourth month, Takeda Motonobu went to the capital from Wakasa Province to join Masamoto. Around the same time, Akamatsu Masanori and Ōuchi Yoshioki unsuccessfully proposed the idea of having Yoshitō succeed Yoshiki as the latter's adopted son.
Reaction of the Imperial Court
Masamoto informed the Imperial Court that he had raised an army on the 23rd of the fourth month. He explained that his opposition to Yoshiki's Kawachi expedition had not been accepted, and he had consequently raised the army to depose Yoshiki and back Yoshitō.Upon hearing of the coup, Emperor Go-Tsuchimikado commanded, and director of the Department of Divinities, to summon three key retainers:,, and. The Emperor expressed a desire to abdicate, both because he was enraged that the shogun he had appointed had been overthrown, and because Prince Katsuhito had come of age. Chikagana and Tadatomiō were against this, with Chikanaga saying "Even if the shogunal family changes and asks difficult things of him, the Emperor's rule is to do as he is told. It would be good if the crown prince were also asked to abdicate by the shogunal family." As a result, the Emperor changed his mind.
For five days starting on the 24th day, the Imperial Court held a planned discussion on the Amitābha Sūtra, and delayed responding to the coup as the Emperor was listening. On the 28th day, Hosokawa Masamoto made an imperial visit, and Yoshitō was promoted to Junior Fifth Rank, Lower Grade. At this time, Chikanaga, who was involved with imperial proclamations, mentioned that "if an imperial visitation is not observed, one must not mutually obey." Although a donation of 300 bolts of cloth had been made, Yoshitō's proclamation as shogun was postponed because Masamoto had not yet met the necessary expenses.
Masanaga dies and Yoshiki surrenders
One of the first actions taken by the new government under Masamoto was to have resign from the position of, which he had held since Bunmei 18, on the fifth day of the intercalary fourth month. Ashizu Toshiyori, descended from the Tenjiku branch of the Hosokawa clan, was appointed as his replacement.On the seventh day of the intercalary fourth month, Masamoto deployed troops under and to Kawachi province in order to subjugate Masanaga. In addition, Hatakeyama Motoie sortied from Takaya Castle, and the daimyo who had sided with Masamoto also allied with him. The combined forces may have exceeded 40,000 men.
Yoshiki and Masanaga were cornered by the Hosokawa army and made a stand at Shōgaku-ji, still maintaining their determination to fight to the end. Yoshiki placed his chambers in the tallest of Shingaku-ji's more than 100 turrets, and the temple was turned into a fortress and its defenses strengthened.
Soon, in the middle of the same month, a large army, including the Negoro-shū, up to 10,000 strong departed from Kii Province, one of Masanaga's territories, and headed towards Shōgaku-ji. However, the Kii forces were forced to stay at Sakai on the way by Akamatsu Masanori. The two armies faced each other at Sakai and began negotiations, but on the 21st they started fighting. The Kii forces had several warships that assisted their land forces, and relentlessly attacked the Akamatsu army. In turn, Masanori personally led the Akamatsu forces and fought hard, and after several hours, defeated the Kii army.
The defeat of the Kii forces, which had been one of Yoshiki and Masanaga's last hopes, shocked them. Had the Kii army won, there would have been an opportunity to cover up the coup, but that prospect vanished, and with food running out Masanaga despaired greatly. On the 24th of the same month, the sieging forces started an assault on Shōgaku-ji. On the morning of the 25th, the fortress fell. Masanaga, along with his chief vassals such as, committed suicide. Afterwards, Yoshiki and his entourage surrendered to Uehara Motohide and carried with them and Mitsurugi. They were sent to the capital, where they were first confined to Ryōan-ji, then to Motohide's residence.
Furthermore, kuge was killed by Motohide, who took orders from Masamoto. As Mitsutada had been a close aide of Yoshimi, and highly trusted by Yoshiki, he had been appointed dainagon over 18 officials, and for a short while held greater power than the five regent houses, the Buddhist temples, and the kanrei. Even Masamoto had proven unable to offer reports to Yoshiki without going through Mitsutada. For Masamoto, he needed to be eliminated like Masanaga. The Hamuro residence in the capital was also demolished when Masamoto raised his troops.
Masanaga's heir,, was forced to abandon his claim to the Hatakeyama family succession and fled from Shōgaku-ji to Kii before his father committed suicide. The Hosokawa forces were unable to capture Hisanobu, and on the 10th day of the ninth month Motohide burned down Sumiyoshi-taisha, as he believed that the kannushi of the shrine, Tsumori Kuninori, was harboring one of the Oshū family's retainers, a member of the Yusa clan.
Subsequent events
Immediate effects
Although Masamoto took control of the shogunate with the Meiō coup, the foundation of the military, including the numerous public servants, collapsed, and after the shogun's authority became nominal Masamoto supported it with the Hosokawa clan. However, there is also the view that the shogunate's authority persisted after the coup, and that Ise Sadamune, who served as Shogun Yoshitō's guardian at Hino Tomiko's wishes, frequently countered Masamoto's actions. Furthermore, when Uehara Motohide, who had lead the coup at Masamoto's orders and was shugodai of Tanba Province under the Keichō family of the Hosokawa clan, suddenly died, many of the Keichō family's retainers came to oppose the coup. As a result, the Keichō family sought the support of the shogunate, and because it was cautious of a recovery of Yoshiki's faction, the post-coup shogunate may have entered into a cooperative relationship with the Keichō family.The shogunate bureaucracy that remained in Kyoto was not lead by Masamoto but by Sadamune's son, Sadamune's successor as head of the mandokoro and shugo of Yamashiro Province, and negotiations between Masamoto and him began. At Tomiko's request, Sadamichi also acted as guardian for Yoshitō, and without Sadamichi's orders to create official documents Yoshitō and Masamoto's decisions would lack the necessary validity. In connection with this, immediately after the Meiō incident, Sadamichi used the pretext of opposing Yoshiki's faction's counterattack to win over the local leadership of the Yamashiro ikki and use them to gain complete control of Yamashiro Province. Masamoto countered by also adopting similar measures. Because of this, the local people were divided into those who supported the Ise clan and those who supported the Hosokawa clan, and the ikki was forcefully disbanded the following year.
As for the Hatakeyama clan, the Oshū family collapsed with the suicide of Masanaga, and Motoie, of the Sōshū family, inherited leadership of the clan with Masamoto's backing. Motoie promptly attacked Kii Province, where Hatakeyama Hisanobu had escaped, but as he was repulsed, the split between the Oshū and Sōshū families remained unresolved.
The current consensus is that the invasion of Izu Province started by Ise Sōzui in the same year was ordered by Yoshitō and done with the cooperation of Masamoto and, with the purpose of deposing the shogun's half-brother, who was horigoe kubō and had killed Yoshitō's mother, Enmain, and younger brother Jundōji. Sōzui was a cousin of Ise Sadamune's who was a retainer of the shogun, and because he was the uncle of the shugo of Suruga Province, Imagawa Ujichika, he held a castle and land in Suruga.
Moreover, the Meiō incident, as well as Ujichika and Sōzui's actions, also had an influence on the third kanrei clan, the Shiba., a retired member of the Buei family of the Shiba Clan, sided with Yoshiki to curtail Masamoto's influence, and Yoshitoshi's son and head of the family,, reorganized the administrations of Owari and Tōtōmi provinces. These actions succeeded in recovering their influence in the shogunage and controlling their shugodai such as the Oda, but while the coup had reduced Yoshitoshi and his son's influence over the shogunate, the Imagawa clan's intermittent invasions of Tōtōmi that had started in the Ōnin War intensified. This forced Yoshihiro to send troops to Tōtōmi from Owari, and the Shiba clan effectively disappeared from the central government.
In the eleventh month of Meiō 3, Yoshitō was officially granted the rank of shō go-i no jō and appointed Captain of the Left Division of the Bureau of Horses, and changed his name to Yoshitaka. In the next month, he was officially created shogun.
The conflict escalates
On the night of the 29th day of the sixth month of Meiō 2, Yoshiki, who had been confined to Uehara Motohide's residence in Kyōto, escaped to in Imizu District, Etchū Province with assistance from his attendants, where he was received by the shugodai of the province and Hatakeyama Masanaga's chief statesman,. More than seventy people, including shogunate retainers, close kuge, and Zen priests who had sided with Yoshiki, followed him to Etchū, where they established a court at Shōkō-ji.From Etchū, Yoshiki circulated a demand for Hosokawa Masamoto to be subdued, after which the Noto Hatakeyama, Echizen Asakura, Echigo Uesugi, and Kaga, among other daimyo, came to him and proclaimed their loyalty. Starting with the Ōtomo clan from Kyūshū, daimyo from more distance provinces also declared their intention to support Yoshiki. Masamoto promptly deployed an army to Etchū, but in the beginning of the ninth month it suffered a significant defeat after fighting the Etchū forces and was driven back. Consequently, Etchū and its neighboring areas completely sided with Yoshiki, and the shogunate at Kyoto could not make a move. Later, in the ninth month of Meiō 7, Yoshiki left Etchū, relying on the Echizen Asakura, and changed his name to Yoshitada.
Early in Meiō 5, the Ōtomo clan under sided with Masamoto. Masachika broke the Ōtomo clan's alliance with the Ōuchi clan by killing his son and Ōuchi Yoshioki's cousin, Yoshisuke, as the Ōuchi were enemies of the Hosokawa. Masachika was quickly captured by Ōuchi forces and forced to commit seppuku. Yoshioki then invaded northern Kyushu, successfully defeating Shōni Masasuke by the ninth month of Meiō 6. Yoshioki then began fighting the Ōtomo clan directly. Masachika's heir, Chikaharu, responded by invading Buzen Province on the second of the tenth month, Meiō 7. During this conflict, Masamoto convinced Yoshioki's brother to join him. The plot was discovered in Meiō 8, and Sonkō rebelled. He was laicized and took the name Takahiro, and fled to Chikaharu in Bungo Province. On the 25th of the seventh month of Meiō 8, Yoshioki dispatched an army under Sugi Shigekata to Buzen.
Hatakeyama Hisanobu, who had escaped to Kii after Shōgaku-ji surrendered, resisted Masamoto's ally Motoie while building his power, and eventually killed Motoie in the second month of Meiō 8. Hisanobu built a massive power base in the region south of Kyōto, from Kii to Kawachi. While struggling to contact Yoshitada in Echizen, he kept watch over the capital, and so became a threat to the Hosokawa forces.
After the ninth month of Meiō 8, Yoshitada and Hisanobu cooperated, and each attempted to move on the capital from Echizen and Kawachi, respectively, in a pincer movement. But after a hard fight, Masamoto defeated Yoshitada, who fled to the Ōuchi clan's capital in Suō Province in Bunki 1. After this, Hisanobu's pincer operation also failed, and he retreated to Kii. Despite this, Yoshitada and Hisanobu remained threats to Masamoto. In addition, Yoshitaka became an adult and took personal control of governmental affairs, and the conflict between him and Masamoto intensified.
In the seventh month of Bunki 2, Yoshitaka changed his name to Yoshizumi, was elevated to Senior Fourth Rank, and was made a sangi and sahyō'e no suke. In the first month of the following year, he was further elevated to Senior Third Rank.
The tide turns
Yoshitada entered Yamaguchi on the second day of Meiō 10. At the same time, the Imperial Court began to support Yoshitada, as did Yoshida Shrine. Yoshizumi and Masamoto responded by forcing Emperor Go-Kashiwabara to declare Yoshitada an enemy of the court. By the end of Bunki 2, Yoshioki had decisively defeated the Ōtomo clan. He subsequently began preparing to march on Kyoto, reinstating the practice of for Chikuzen and Buzen in Bunki 3 and 4. In Eishō 4, Yoshioki wrote letters in which he declared his intention to restore prosperity to Japan.At the same time, the divide between the Keijō branch and the Awa branch of the Hosokawa worsened. Hosokawa Yoshiharu, who had been established as a rival candidate to Masamoto by Yoshitada, died two years after the coup, seemingly ending the rivalry between the two branches of the Hosokawa clan. However, as he was dedicated to Shugendō, Masamoto had no children, and as he feared the rise of cadet branches such as the Awa Hosokawa, he purposely adopted from the Kujō clan, one of the five regent houses, instead of someone from the Hosokawa clan. But the cadet clans strongly opposed Sumiyuki, who was unrelated to the Hosokawa clan, being the clan's successor, and in Bunki 3 Masamoto was forced to adopt Yoshiharu's son Sumimoto and disinherit Sumiyuki. This resulted in Sumiyuki's partisans, including, killing Masamoto on the 23rd of the sixth month of Eishō 4.
Masanaga supported the youngest son of kampaku Kujō Hisatsune, Hosokawa Tsuneyuki, as Masamoto's successor. Sumimoto was not in the capital at the time of Masamoto's death, so he and his supporters, including, marched with an army of 3,000 men from Awa in the seventh month of Eishō 4. They defeated Masanaga in the following month, and Sumimoto was declared kanrei. In the first month of the same year, the news of Masamoto's death reached Ōuchi Yoshioki. By the 25th day of the eleventh month, Yoshioki and Yoshitada started marching north, with an army of 11,000-13,000 troops and a fleet of 660 ships. The fleet arrived at Hyōgo on the 23rd of the fourth month of Eishō 5, while the army arrived six weeks later, on the eighth of the sixth month.
In the fourth month, Sumimoto moved to Awa, while Yoshizumi went to Ōmi and requested the support of. When Hosokawa Sumimoto fled, he was replaced by Hosokawa Takakuni, who supported Yoshitada and Yoshioki. At the same time, Yoshitada set up camp at Sakai. Nagateru marched to Kyoto in the following month and combined his forces with Takayori's. They were defeated, and Yoshitada entered the capital in the sixth month. In the seventh month, he was reinstated as shogun, made dainagon, and returned to Senior Third Rank. In addition, Yoshioki was made kanrei. In the twelfth month, Yoshitada was further elevated to Senior Second Rank.
Yoshitada then paid homage to Emperor Go-Kashiwabara in the sixth month of Eishō 6. On the 27th of the tenth month, supporters of Yoshizumi and Sumimoto broke into the shogun's residence. Yoshitada fought them, and received nine minor injuries. In the same month, Yoshitada raised an army to attack Ōmi Province, which entered the province on the 14th of the second month of Eishō 7. They were repelled on the 26th.
In the 8th month of the following year, Yoshizumi died in Ōmi Province. In the same month, gathered troops from Shikoku and eastern provinces and prepared to attack Kyoto. Yoshitada and Yoshioki fled to Tanba Province, and Masakata entered the capital. In response, Yoshitada assembled an army and fought Masakata at Mount Funaoka, the latter of whom was killed in the battle.
Aftermath
Following the Meiō incident, the shogunal family was divided into the "Yoshitane branch" and the "Yoshizumi branch", all of whom were given titles used by the head of Ashikaga shogunal family such as "Muromachi-dono," "Kubō," or "Taiju." There is a theory that the and assassinated the 13th shogun, Yoshiteru, in order to end this division. However, the division of the shogunal family and the conflicts among various factions continued throughout the Sengoku period, only ending when Oda Nobunaga entered the capital.Analysis
The Meiō incident was not limited to the capital. Throughout Japan, and especially in the east, warfare and gekokujō created significant crossroads that had the opportunity to change the status quo. Although the Ōnin War is traditionally thought of as the start of the Sengoku period, historian Ryōichi Suzuki's proposal that the Meiō incident was the start of the Sengoku period has become more prominent in recent years.Causes
The main reason that Hosokawa Masamoto rebelled against Ashikaga Yoshiki was that, although Yoshiki had promised to leave government affairs to Masamoto, he ignored his objections to the large-scale Rokkaku and Kawachi military campaigns. This can be inferred from Masamoto's own reports to the Imperial Court and 's records. Initially, Yoshiki decided on the Kawachi expedition in response to Hatakeyama Masanaga's request. As mentioned above, it was essential for Masamoto that the reunification of the Hatakeyama clan was prevented, but Yoshiki disregarded his objections. Yoshiki approached Masanaga in order to reduce his dependance on Masamoto, with the expectation that in doing so he could demand Masanaga's gratitude. Hatakeyama Motoie had been chased to the point of nearly being ruined, and the reunification of the Hatakeyama was imminently approaching. It was only a matter of time until the Hatakeyama, whose power had been steadily reduced since Masamoto's father was alive, were restored as a powerful daimyo in Kinai, and Masamoto needed to halt the Kawachi expedition even if it meant raising an army. This is considered to be the reason why Masamoto secretly colluded with Motoie.Moreover, Yoshiki is believed to have been planning Masamoto's removal, and, with regards to the causes of the coup, Jinson records that it was because Yoshiki had wanted to defeat Masamoto as the latter had opposed his policies. Yoshiki was quickly turning to Masamoto's rival Hosokawa Yoshiharu, who was head of the most powerful branch of the Hosokawa clan, the Awa Hosokawa. In the sixth month of Entoku 3, Yoshiki gave him the character 義 and allowed him to change his name to Yoshiharu from Yukikatsu, and moved his residence from the gosho on sanjō to Yoshiharu's mansion on ichijō and aburanokōji.
Not only was Yoshiharu's status rising, Yoshiki's personal authority was increasing while Masamoto's was decreasing. Yoshiki had not initially been in a position to become shogun, and as he had suddenly become shogun after Yoshihisa's death, his connections with his close followers and the daimyo were weak, so it was vital for him to prove his abilities. This is likely why he continued the campaigns over Masamoto's objections. Yoshiki then increased his power by showing his bravery on the front lines, achieving the subjugation of the Rokkaku where Yoshihisa could not and succeeding in the conquest of Kawachi. Along with the strengthening of his authority, political power in Japan was centering around Yoshiki while Masamoto was becoming more and more isolated. Because Yoshiki was subsequently cold to Masamoto and was getting close to Hatakeyama Masanaga and Hosokawa Yoshiharu, it is not surprising that Masanaga was driven by the fear that he would be killed by yoriki such as Yoshiharu and Masanaga. This has also been identified as a reason that compelled Masamoto to rise up and overthrow Yoshiki.
The daimyo participated in the Rokkaku and Kawachi campaigns because they were opportunities to prove their loyalty to the shogun, and if a crisis had fallen upon them, they could expect assistance from a large army from other daimyo in the name of the shogun. In the Rokkaku campaign, demanded the recovery of Echizen Province, which had been annexed by the Asakura clan in the Ōnin War. Yoshiki responded favorably, and he is believed to have planned an Echizen campaign following the Kawachi campaign. Had Yoshiki actually made the order for the Echizen campaign, the mobilizing of the various daimyo could have been enough to destroy the Asakura clan.
But Yoshiki's decision to dispatch troops twice in succession clearly imposed a burden on the daimyo, with large war expenditures and provisions. For example, the Ōuchi clan raised 16,000 koku of army provisions from their home province during the Rokkaku campaign. It was obvious that the Echizen campaign, planned to begin after the Kawachi campaign, would further burden the daimyo. This likely caused a feeling of war-weariness to spread among the daimyo, and when Masamoto's coup forced them to choose between Masamoto and Yoshiki, everyone except Masanaga joined him.
Hino Tomiko supported Yoshitō because, as a representative of the shogunal family, she was concerned by Yoshiki's reckless use of power. This was already a worry of hers since his father, Yoshimi, had destroyed Ogawa-gosho, but as Yoshiki had continued to increase the burden of the daimyō with large military campaigns, the daimyō slowly grew to be dissatisfied with the shogunate. Had Yoshiki continued to be shogun, there was a possibility that the Echizen campaign would have started and military campaigns would have continued, and the daimyo would have inevitably grown even more dissatisfied. Tomiko, who had come to carry the burden of the shogunal family for many years, likely felt that a great crisis of the existence of the shogunate was approaching. Ultimately, the decision to overthrow Yoshiki was not only Masamoto's, but also Tomiko's.
The reason that even the shogun's immediate followers abandoned Yoshiki was the influence of Tomiko and mandokoro Ise Sadamune. As mentioned above, Tomiko was a representative of the shogunal family, so Yoshiki's decisions depended on her support. For that reason, when she decided to depose Yoshiki, the shogun's immediate followers' decisions are believed to have been heavily influenced by her. Like Masamoto, Sadamune was in contact with Hatakeyama Motoie's retainers, and as previously mentioned, the daimyo participating in the Kawachi campaign, as well as the shogun's immediate followers, deserted Yoshiki due to forged documents, the contents of which are unknown. Furthermore, it is recorded that, a month before the incident, Motoie was told of a plot to overthrow the shogun, so Sadamune was clearly already laying the groundwork to support Yoshitō. It is likely that Sadamune's actions also contributed greatly to Yoshitō's succession, as Yoshitō even declared that he would entrust all government affairs to Sadamune.
In her capacity as a member of the shogunal family, Tomiko's recognision of these actions lent great legitimacy to the coup, resulting in the daimyo and the shogun's immediate followers abandoning Yoshiki and supporting Yoshitō. The coup was not something that Masamoto was able to do on his own, but was rather something that could only be done with Tomiko and Ise Sadamune's support.