Pope Martin I (d. 16 September 655) was pope from 649 to 655. Martin I was a critic of Monothelites, and condemned their leaders in writing. He incurred the wrath of Constans II, who ordered Martin kidnapped and brought to Constantinople. Martin was imprisoned for a time, and then exiled to Kherson in present-day Ukraine, where he died in 655.
In his memoir, Justinian II described his grandfather's seizure and exile of Pope Martin I and Maximus the Confessor. Justinian was also exiled to Kherson during the course of his life. He concluded from that experience that Constans II must have been a hard man indeed to send both Martin and Maximus there.