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in 451Battle of Avarayr between Armenian rebels and the Sassanid Empire takes place.
The Empire defeats the Armenians militarily but guarantees them freedom to openly practice Christianity. The Battle of Avarayr also known as Battle of Vartanantz, was fought on May 26, 451 on the Avarayr Plain in Vaspurakan, between the Armenian Army under Saint Vartan and their Sassanid rulers. Although the Persians were victorious on the battlefield itself, they had heavy casualties and, following subsequent uprisings and guerilla warfare, the Armenians were eventually guaranteed religious freedom.