Life and Martyrdom
Orestes belonged to the city of Tyana in Cappadocia, a region of Asia Minor that produced many martyrs and saints in the early centuries of the Church. By profession he was a physician, and the tradition preserved in Greek and Slavic sources describes him as learned and skillful in his art.
He lived during the reign of Diocletian, whose persecution sought to compel Christians throughout the empire to offer sacrifice to the pagan gods. When called upon to renounce his faith and join in this worship, Orestes confessed Christ and refused. For this confession he was subjected to torture and was put to death, receiving the crown of martyrdom.
The accounts of his life that have come down are brief, and the specific tortures he endured and the manner of his death are not recorded in the surviving sources.