Annales Cambriae, or The Annals of Wales, believed to date from 970, is a chronicle of events thought to be significant occurring during the years 447-954. It is widely accepted that the first entry (listed "Year 1") was made in 447; however, some sources claim that some entries may have been 'interpolated' in later years (details, names etc. added). Despite the name, it does not only record events in Wales, but also mentions events in Ireland, Cornwall and England and sometimes further afield.

Source for Arthurian history

English historians in the Middle Ages