 The dates, particularly from the fourth to the late sixth centuries, have very few contemporary sources and are largely later constructions by medieval chroniclers.The historian Diana Greenway described one such 12th century chronicler, Henry of Huntingdon, as a 'weaver' compiler of history, and the archaeologist Martin Welch described the "Anglo-Saxon Chronicle" as "a product of the West Saxon court... concerned with glorifying the royal ancestry of Alfred the Great.Manipulation of royal genealogies, in this and other sources, to enhance the claims of present rulers was common.