Pope Gregory I (Latin: Gregorius I; c. 540 – 12 March 604), commonly known as Saint Gregory the Great, was Pope from 3 September 590 to his death in 604. Gregory is well known for his writings, which were more prolific than those of any of his predecessors as pope. He is also known as St. Gregory the Dialogist in Eastern Christianity because of his Dialogues. For this reason, English translations of Eastern texts will sometimes list him as Gregory "Dialogos" or the Latinized equivalent "Dialogus".
A senator's son and himself the Prefect of Rome at 30, Gregory tried the monastery but soon returned to active public life, ending his life and the century as pope. Although he was the first pope from a monastic background, his prior political experiences may have helped him to be a talented administrator, who successfully established papal supremacy. He was stronger than the emperors of declining Rome, and challenged the power of the Patriarch of Constantinople in the battle between East and West. Gregory regained papal authority in Spain and France, and sent missionaries to England. The realignment of barbarian allegiance to Rome from their Arian Christian alliances shaped medieval Europe. Gregory saw Franks, Lombards, and Visigoths align with Rome in religion.