established Christianity in Kent and the surrounding countryside and contributed a Roman tradition to the practice of Christianity in Britain. Background By the 4th century the Roman province of Britannia was converted to Christianity and had even produced its own heretic in Pelagius. Britain sent three bishops to the Synod of Arles in 314, and a Gaulish bishop went to the island in 396 to help settle disciplinary matters. Lead baptismal basins and other artefacts bearing Christian symbols testify to a growing Christian presence at least until about 360. After the Roman legions withdrew from Britannia in 410 the natives of Great Britain were left to defend themselves, and non-Christian Angles, Saxons, and Jutes—generally referred to collectively as Anglo-Saxons—settled the southern parts of the island. Though most of Britain remained Christian, isolation from Rome bred a number of distinct practices—Celtic Christianity—including emphasis on monasteries instead of bishoprics, differences in calculation of the date of Easter, and a modified clerical tonsure. Evidence for the continued existence of Christianity in eastern Britain at this time includes the survival of the cult of Saint Alban and the occurrence of eccles—from the Latin for church—in place names. There is no evidence that these native Christians tried to convert the Anglo-Saxon newcomers. The Anglo-Saxon invasions coincided with the disappearance of most remnants of Roman civilisation in the areas held by the Anglo-Saxons, including the economic and religious structures. Whether this was a result of the Angles themselves, as the early medieval writer Gildas argued, or mere coincidence is unclear. The archaeological evidence suggests much variation in the way that the tribes established themselves in Britain concurrently with the decline of urban Roman culture in Britain. The net effect was that when Augustine arrived in 597 the Anglo-Saxon kingdoms had little continuity with the preceding Roman civilisation. In the words of the historian John Blair, "Augustine of Canterbury began his mission with an almost clean slate." Sources Most of the information available on the Gregorian mission comes from the medieval writer Bede, especially his Historia ecclesiastica gentis Anglorum, or Ecclesiastical History of the English People. For this work Bede solicited help and information from many people including his contemporary abbot at Canterbury as well as a future Archbishop of Canterbury, Nothhelm, who forwarded Bede copies of papal letters and documents from Rome. Other sources are biographies of Pope Gregory, including one written in Northern England around