Battle of Avarayr
The Battle of Avarayr was fought on 26 May 451 on the Avarayr Plain in Vaspurakan between a Christian Armenian army under Vardan Mamikonian and Sassanid Persia. It is considered one of the first battles in defense of the Christian faith. Although the Persians were victorious on the battlefield, it was a pyrrhic victory. The Armenians were allowed to continue practising Christianity freely.
The battle is seen as one of the most significant events in Armenian history. The commander of the Armenian forces, Vardan Mamikonian, is considered a national hero and has been canonized by the Armenian Apostolic Church.
Background
The Kingdom of Armenia under the Arsacid dynasty of Armenia was the first nation to officially convert to Christianity, in 301 under Tiridates III. In 428, Armenian nobles petitioned Bahram V to depose Artaxias IV. As a result, the country became a Sassanid dependency with a Sassanid governor. The Armenian nobles initially welcomed Persian rule, provided they were allowed to practise Christianity; but Yazdegerd II, concerned that the Armenian Church was hierarchically dependent on the Latin- and Greek-speaking Christian Church tried to compel the Armenian Church to abandon Rome and Byzantium in favour of the Church of the East or simply convert to Zoroastrianism. He summoned the leading Armenian nobles to Ctesiphon, and pressured them into cutting their ties with the Orthodox Church as he had intended.The unsteadiness of the empire was ever-increasing under Yazdegerd II, who had an uneasy relationship with the aristocracy and was facing a great challenge by the Kidarites in the east. Yazdegerd II needed the cooperation of the aristocracy so that he could have an organized government to combat the external and internal issues endangering the empire. His policy of integrating the Christian nobility into the bureaucracy led to a major rebellion in Armenia. The cause of the rebellion was the attempt by his minister Mihr-Narseh to impose the Zurvanite variant of Zoroastrianism in Armenia. His intentions differed from those of Yazdegerd II. As a result, many of the Armenian nobles rallied under Vardan Mamikonian, the supreme commander of Armenia. The Armenian rebels tried to appeal to the Romans for help, but to no avail. Meanwhile, another faction of Armenians, led by the marzban Vasak Siwni allied themselves with the Sasanians.