Britain 500 C.E.
The Early History of England is very poorly known although both Archaeology and Genetics may now be providing much greater information on the origin of England.1
However the textual information on the early history and origin of England and the English is based on 4 sources. Which are in chronological order:
1, On The Ruin of Britain, by St. Gildas, written c. 520-560 C.E.
For On the Ruin of Britain, see Here
For The Ecclesiastical History of the English People, see Here
For The Anglo-Saxon Chronicle, see Here
1. See An Archaeology of the Early Anglo-Saxon Kingdoms, C. J. Arnold, Routledge, London, 1997. and Saxons, Vikings, and Celts: The Genetic Roots of Britain and Ireland, Bryan Sykes, W.W. Norton and Company, New York, 2006.