Born in Galata in Constantinople, he was first named Diamantis. He led a dissolute life in his youth, even embracing Islam. Then a bitter repentance grew in him, and he went to the Holy Mountain where, as a monk, he lived for twelve years in strict asceticism in the Lavra of St Athanasius. Desiring martyrdom, to cleanse him from his sin, he travelled to Constantinople and went into the mosques, making the sign of the Cross and calling out to the Turks that their faith was false, and that Jesus Christ is God and Lord. He was beheaded before the gateway of the Phanar on November 13th, 1681. His relics are preserved on Halki, in the monastery of the Holy Trinity.