History of the Britons (historia Brittonum)

Compiled around AD 833 by a Welsh scholar, this is one of the very few surviving accounts of Britain in the centuries after Roman rule collapsed. Nennius gathered oral traditions, earlier written sources, and genealogical lists to construct a history of the Britons from their legendary ancestor Brutus of Troy through the Saxon invasions. The text pulses with cultural urgency: it names twelve battles fought by Arthur against the Saxons, preserves the oldest surviving list of Arthur's twelve battles, and records traditions that would otherwise be lost entirely. This is not modern history but something more fragile and precious: a medieval mind's attempt to make sense of a fractured past, weaving myth, genealogy, and fighting records into a single narrative of survival. For anyone curious about where Arthurian legend truly begins, or how the Britons remembered themselves after empire, this is the source text.