Pope from 649-654, St. Martin I was a courageous defender of the faith against heresy. He held a council at Rome which condemned the Monothelite heresy which taught that Christ had no human but only a divine will. The heretical emperor, Constans II, had him treacherously arrested and taken to Constantinople. After many sufferings and humiliations, he was exiled to Cherson in the Crimea where he died of exhaustion in 654.