Pope Martin I (Latin: Martinus I; born between 590 and 600, died 16 September 655) reigned from 21 July 649 to his death in 655. He succeeded Pope Theodore I on 5 July 649. He was the only pope during the Byzantine Papacy whose election was not approved by a iussio from Constantinople. Martin I was abducted by Emperor Constans II and died at Cherson. He is considered a saint and martyr by the Catholic Church and the Eastern Orthodox Church.
Martin was very energetic in publishing the decrees of the Lateran Council of 649 in an encyclical, and Constans replied by enjoining his exarch (governor) in Italy to arrest the pope should he persist in this line of conduct and send Martin as a prisoner from Rome to Constantinople. He was also accused by Constans of unauthorised contact and collaboration with the Muslims of the Rashidun Caliphate - allegations which he was unable to convince the infuriated imperial authorities to drop.
The arrest orders were found impossible to carry out for a considerable period of time, but at last Martin was arrested in the Lateran on 17 June 653 along with Maximus the Confessor. He was hurried out of Rome and conveyed first to Naxos, Greece, and subsequently to Constantinople, where he arrived on 17 September 653. He was saved from execution by the pleas of Paul, patriarch of Constantinople, who was himself gravely ill. After suffering an exhausting imprisonment and many alleged public indignities, he was ultimately banished to Chersonesus (present day Crimea region), where he arrived on 15 May 655 and died on 16 September of that year.