(540 - 604; r. 590 - 604) One of the 'Latin Fathers' of the church and is considered the founder of the medieval papacy. After remarking that some English boys at a slave market were 'not Angles, but angels,' he sent Augustine of Canterbury on a mission to Christianize southern Britain. His writings include a Commentary on Job and Pastoral Care, and he is known as the Dialogist in Eastern traditions. He is credited with introducing Gregorian chant, named in his honor, into the Catholic rite.