Martin I was a pope who served from 649 to 655 AD. He is known for his strong opposition to the Monothelite heresy, which claimed that Christ had only one will. His stance on this issue led to significant conflict with the Byzantine Emperor Constans II, resulting in his arrest and exile. During his papacy, Martin I convened the Lateran Council in 649, which condemned Monothelitism and affirmed the belief in Christ's two wills. He is remembered as a martyr for his faith and is venerated as a saint in both the Roman Catholic and Eastern Orthodox Churches.