The Catholic Church in England and Wales is part of the worldwide Roman Catholic Church in full communion with the Pope. Celtic Christianity, with some traditions different from those of Rome, was present in Roman Britain from the first century AD, but after the departure of the Roman legions was in retreat to Paganism. In 597 AD, the first authoritative papal mission, establishing a direct link from the Kingdom of Kent to the See of Rome and to the Benedictine form of monasticism, was carried into effect by Augustine of Canterbury.