I have learned that the Anglo Saxon Chronicles are incomplete
because they were copied from other documents, and the Saxons
would leave out their defeats in
battle which left big chunks in the story.
The British Chronicles written by Nennius and the Chronicles of Gildas as well as the Welsh Chronicles by
Bede are all much more accurate of the dark ages in British history as they were
written several hundred years earlier then the Anglo Saxon Chronicles. There is
also the ancient book of the Kings of Britain believed to cover the Cornish Kings of
the bronze and early Iron age, you can also read the
Magna Carta and much more. I hope you find it as interesting as I did.