Pope Saint Gregory I (Latin: Gregorius I), commonly known as Saint Gregory the Great, was Pope of the Catholic Church from 3 September 590 to his death in 604. Gregory is famous for instigating the first recorded large-scale mission from Rome, the Gregorian Mission, to convert a pagan people to Christianity. Gregory is also well known for his writings, which were more prolific than those of any of his predecessors as pope. The epithet Saint Gregory the Dialogist has been attached to him 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. During his papacy he greatly surpassed with his administration the emperors in improving the welfare of the people of Rome, and successfully challenged the theological views of Patriarch Eutychius of Constantinople before the emperor Tiberius II. 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.
Throughout the Middle Ages he was known as "the Father of Christian Worship" because of his exceptional efforts in revising the Roman worship of his day. His contributions to the development of the Divine Liturgy of the Presanctified Gifts, still in use in the Byzantine Rite, were so significant that he is generally recognized as its de facto author.
Gregory is a Doctor of the Church and one of the Latin Fathers. He is considered a saint in the Catholic Church, Eastern Orthodox Church, Anglican Communion, and some Lutheran denominations. Immediately after his death, Gregory was canonized by popular acclaim. The Protestant reformer John Calvin admired Gregory and declared in his Institutes that Gregory was the last good pope. He is the patron saint of musicians, singers, students, and teachers.