The mission of St Augustine of Canterbury and the subsequent conversion of the pagan Anglo-Saxons to Christianity had dramatic political, social and cultural implications as well as religious ones. The arrival of St Augustine in 597AD redefined England's relations with the continent on one hand and with the Celtic lands on the other; it led to new social mores; it added a new dimension to the political organization of the land; and it imported new forms of culture, notably book production and manuscript illumination.