Adeodatus I was a Benedictine priest who served as the Bishop of Rome from 615 until his death in 618. Born in Rome to a subdeacon, he had served as a priest for four decades before his election to the papacy. His ascension marked the first time a priest was chosen for this office since the reign of John II in 533. His brief pontificate was characterized by a shift away from the monastic administrative reforms established by his predecessor, Gregory the Great.