The Saxons, Jutes and Angles
From about AD 350, Germanic tribes began invading south-east England. The tribes came from what is now northern Germany, Holland and Denmark. The first to come were the Saxons, joined later by the Jutes and Angles. The Angles gave England its name. Britain had the protection of only a few Roman legions. The native people could not stop the new enemy, known as the Anglo-Saxons.
The Celts fled north and west taking their ancient arts and languages with them. Celtic languages have disappeared from most of Europe, but are still spoken in parts of Wales, Ireland and Scotland. Celtic Christians later returned to England from Scotland and Ireland as missionaries. The Anglo-Saxons in southern England were converted to Christianity following the arrival of Saint Augustine of Rome in AD 597. As Christianity spread, churches and monasteries were built all over England.
Michael Vaughan-Rees, Geraldine Sweeney, Picot Cassidy: In Britain. 21st Century Edition, Cornelsen Verlag, 2000, page 9