The History of the Britons (Latin: Historia Brittonum) is a purported history of early Britain written around 828 that survives in numerous recensions from after the 11th century. The Historia Brittonum is commonly attributed to Nennius, as some recensions have a preface written in that name. Some experts have dismissed the Nennian preface as a late forgery and argued that the work was actually an anonymous compilation. Overview. The Historia Brittonum describes the supposed settlement of Britain by Trojan settlers and says that Britain was named for Brutus, a descendant of Aeneas.
https://en.wikipedia.org/wiki/Historia_Brittonum