Nennius is believed to have lived in the area made up by Brecknockshire and Radnorshire in present-day Powys, Wales. Nennius was a student of Elvodugus, commonly identified with the bishop Elfodd of Bangor who convinced British ecclesiastics to accept the Continental dating for Easter, and who died in 809 according to the Annales Cambriae. Germanus and Vortigern, and documents events associated with the Anglo-Saxon invasion of the 7th century as contributed by a Northumbrian document.

It also includes the legendary origins of the Picts, Scots, St. The Historia Brittonum was highly influential, becoming a major contributor to the Arthurian legend, in particular for its inclusion of events relevant to debate about the historicity of King Arthur. He has traditionally been attributed with the authorship of the Historia Brittonum, based on the prologue affixed to that work, This attribution is widely considered a secondary (10th century) tradition. The Britons who, suspecting no hostilities, were unprovided with the means of defence, were unanimously and incessantly attacked, both by the Scots from the west, and by the Picts from the north. 1 This attribution is widely considered a secondary (10th-century) tradition. The book is quite lengthy, covering the history of Britain from its origins to the lifetime of Nennius. The Britons came to Britain in the third age of the world and in the fourth, the Scots took possession of Ireland. He has traditionally been attributed with the authorship of the Historia Brittonum, based on the prologue affixed to that work. Nennius - or Nemnius or Nemnivus - was a Welsh monk of the 9th century. Nennius or Nemnius or Nemnivus was a Welsh monk of the 9th century. Nennius: The History of the Britons, full text of chaps 1-66 is also online.

Nennius history of the britons