Pope Gregory I no relation Council of Arles
History
Roman
Christianity in Britain is referred to by Tertullian as early as 208 AD and Origen mentions it in 238 AD. In 314 three Bishops from Britain attended the Council of Arles.There is a medieval London tradition that St Peter upon Cornhill church in London was the seat of English Christianity until the founding of Canterbury in 597 AD. Whether this is true has not yet been established. However, St Peter's is positioned directly above the potential location of a pagan Aedes (or shrine room) in the great Roman Basilica of London, and there is a tradition that a native British King, Lucius, converted to Christianity in 179 AD and founded St Peter's as the seat of the archbishop of the English Church.Either way, Canterbury was therefore a relative latecomer to English Christianity. The  first bishop to have his seat the cathedral was Augustine of Canterbury, who had previously been abbot of St Andrew's Benedictine Abbey in Rome,  sent  at the head of a group of missionaries to the English by Pope Gregory I in 596. Augustine founded the cathedral in 597 and dedicated it to Jesus Christ, the Holy Saviour. When other dioceses were founded in England Augustine was made archbishop. 
Augustine also founded the Abbey of St Peter and Paul outside the Canterbury city walls. This was later rededicated to St Augustine himself and was for many centuries the burial place of the successive archbishops. The abbey is part of the World Heritage Site of Canterbury, along with the cathedral and the ancient Church of St Martin.
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