Gregory I, St. ("The Great")
Personal
Prefect of Rome in 570
Became a monk in 575
Elected pope (r. 590-604)
Enhanced prestige of the papacy
Upheld Rome's traditional claims of
  church primacy over the patriarch of
  Constantinople; Extensive pastoral activity.
Introduced liturgical reforms and Gregorian
  chant
Place and dates
Rome
540?-604
Writings
Moralia: a commentary on the Book of Job
Pastoral Care: describes the ideal bishop; instruction on the
  practice and nature of preaching
Dialogues: legends of saints of his own time.