A Roman monk sent by Pope Gregorio to convert the English to Christianity in AD 596.

St. Augustine and his companions entered Britain under the authority of King Aethelbert of Kent and established the church at Canterbury.

Though he lived a century after the Arthurian period, the Prose Tristan says that he converted Lyonesse and Cornwall to Christianity several generations before Arthur's time, and in Perlesvaus, Arthur experiences a spiritual rebirth at St. Augustine's chapel in the White Forest.