John the Warrior (Greek: Ἰωάννης ὁ στρατιώτης, Russian: Иоанн Воин, Ioann Voin) or John the Soldier in the Catholic Church is a Christian saint and martyr. He was born in the 4th century and lived until his death in the Byzantine Empire. Forced by Julian the Apostate to serve as a warrior against Christianity, he was imprisoned after being caught helping people in need or defending Christians, and awaited there his death penalty. However, John the Warrior was released after the death of the emperor during a war.