"Beldegg" or "Beldeg" is the ancestor name stated in the Anglo-Saxon Chronicle for the Anglo-Saxon kings of England. They are supposed to stem from the sons of Odin that, according to Snorri Sturlusson's Edda, were set to rule the Saxon territories of Germany when Odin in Ynglinga saga moved north, first to Fyn and Odense and then to Svitjod.
See also Gaut for the Edda listing of the ancestors of Odin.