Iyo Province
Iyo Province was a province of Japan in the area of northwestern Shikoku. Iyo bordered on Sanuki Province to the northeast, Awa to the east, and Tosa to the south. Its abbreviated form name was Yoshū. In terms of the Gokishichidō system, Iyo was one of the provinces of the Nankaidō circuit. Under the Engishiki classification system, Iyo was ranked as one of the "upper countries" in terms of importance, and one of the "far countries" in terms of distance from the capital. The provincial capital was located in what is now the city of Imabari, but its exact location is still unknown. The ichinomiya of the province is the Ōyamazumi Shrine located on the island of Ōmishima in what is now part of Imabari. The people spoke Iyo dialect.
File:The Famous Scenes of the Sixty States 57 Iyo.jpg|thumb|right|Hiroshige ukiyo-e "Iyo" in "The Famous Scenes of the Sixty States", depicting the port city of Saijō
History
Iyo Province was formed by the Ritsuryo reforms by combining the territories of the Iyo-no-kuni no miyatsuko, who ruled a territory centered on what is now the city of Iyo and town of Masaki with Kumi Province, Kazehaya Province, Touma Province, and Koichi Province each ruled by its own kuni no miyatsuko. The Geiyo Islands in the Seto Inland Sea were considered part of Aki Province into the Edo Period. During the Heian period, the coastal areas of the province were part of the stronghold of Fujiwara no Sumitomo, who led a rebellion against Imperial authority. During the Muromachi period, a branch of the Saionji family was appointed as shugo by the Ashikaga shogunate, but was constantly being invaded his more powerful and aggressive neighbors. The Saionji survived by the fluid loyalties and fierce resistance, but were eventually overcome by Chōsokabe Motochika, who was in turn overthrown by the forces of Toyotomi Hideyoshi. Under the Tokugawa shogunate, the province was divided into several feudal domains.| Name | Clan | Type | kokudaka |
| Iyo-Matsuyama Domain | Hisamatsu-Matsudaira clan | Shinpan | 150,000 koku |
| Uwajima Domain | Date clan | Tozama | 100,000 koku |
| Iyo-Yoshida Domain | Date clan | Tozama | 30,000 koku |
| Ōzu Domain | Katō clan | Tozama | 66,000 koku |
| Niiya Domain | Katō clan | Tozama | 10,000 koku |
| Imabari Domain | Hisamatsu-Matsudaira clan | Fudai | 35,000 koku |
| Saijō Domain | Matsudaira clan | Shinpan | 30,000 koku |
| Komatsu Domain | Hitotsuyanagi clan | Tozama | 10,000 koku |
Per the early Meiji period Kyudaka kyuryo Torishirabe-chō, an official government assessment of the nation’s resources, the province had 964 villages with a total kokudaka of 434,408 koku. Iyo Province consisted of the following districts:
| District | kokudaka | villages | status | Currently |
| Uma District, Ehime | 22,364 koku | 56 villages | Tenryō ; Imabari, Saijō, Tenryō/Saijō, Tenryō/Imabari | Dissolved, now Saijō, Shikoku-chūō |
| Nii District, Ehime | 36,694 koku | 53 villages | Tenryō ; Komatsu, Saijō, | Dissolved; now Saijō, Niihama |
| Shūfu District, Ehime | 23,142 koku | 38 villages | Iyo-Matsuyama, Komatsu, Saijō, Matsuyama/Komatsu, Komatsu/Saijō | Dissolved; now Saijō, Tōon |
| Kuwamura District, Ehime | 14,650 koku | 29 villages | Tenryō ; Iyo-Matsuyama ; Tenryō/Matsuyama | Dissolved; now Saijō |
| Ochi District, Ehime | 46,790 koku | 106 villages | Tenryō ; Imabari ; Iyo-Matsuyama | merged into Ōchi District on April 18, 1896, now Imabari, Kamijima |
| Noma District, Ehime | 16,587 koku | 29 villages | Iyo-Matsuyama | merged into Ōchi District on April 18, 1896; now Imabari |
| Kazahaya District, Ehime | 18,351 koku | 84 villages | Tenryō ; Iyo-Matsuyama ; Ozu ; Matsuyama/Ozu | Dissolved, now Matsuyama |
| Wake District, Ehime | 16,345 koku | 25 villages | Iyo-Matsuyama | Dissolved, now Matsuyama |
| Onsen District, Ehime | 22,824 koku | 36 villages | Iyo-Matsuyama | Dissolved, now Matsuyama, Toon |
| Kume District, Ehime | 17,554 koku | 32 villages | Iyo-Matsuyama | Dissolved, now Matsuyama, Toon |
| Ukena District, Ehime | 38,834 koku | 102 villages | Iyo-Matsuyama ; Ozu, Niiya ; Matsuyama/Ozu ; Ozu/Niiya | Ozu, Seiyo, Uchiko, Iyo, Matsuyama, Toon, Tobe |
| Iyo District, Ehime | 27,949 koku | 41 villages | Iyo-Matsuyama ; Ozu, Niiya ; Matsuyama/Ozu ; Ozu/Niiya | Masaki, Tobe, Iyo |
| Kita District, Ehime | 33,491 koku | 83 villages | Ozu, Niiya ; | Ozu, Iyo, Seiyo, Naishi |
| Uwa District, Ehime | 98,828 koku | 250 villages | Uwajima, Iyo-Yoshida ; | Uwajima, Seiyo, Ozu, Naishi |
Following the abolition of the han system in 1871, Iyo Province became Ehime Prefecture.