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.