Chronicon 1248-52, 1299-1301

In the consulship of the illustrious Lucian ... At this time [AD 413] the Briton Pelagius put out the doctrine against the Grace of Christ that bears his name, assisted by Ccelestius and Julian, and drew many into his error, declaring that each man was directed to righteousness of his own choice and received as much grace as he deserved, since Adam’s sin harmed him alone: it did not also bind those that came after him. As a result it was possible for those who so wished to be free from all sin; all children were born as innocent as the first man before the fall, nor should they be baptised in order to lay aside (original) sin but to be honoured with the sacrament of adoption (into the Church).

In the consulship of Florentius and Dionysius [AD 429] ... the Pelagian Agricola, son of the Pelagian bishop Severianus, corrupted the Church in Britain by the introduction of his doctrine.