Isidore of Seville: Etymologies
Jordanes: Getica

Nennius: Historia Brittonum

The Historia Brittonum, or History of the Britons, traditionally ascribed to Nennius, was probably written in the early ninth century. Its account of events in early Britain provided much of material for later Arthurian legend.

Historia Brittonum at Amazon: United States | Canada | United Kingdom | France | Germany | Spain | Italy

Free online texts

Gutenberg: History of the Britons, multiple formats. 

Internet Archive: Six old English chronicles. Ethelwerd's Chronicle. Asser's Life of Alfred. Geoffrey of Monmouth's British history. Gildas. Nennius. And Richard of Cirencester, translated by J. A. Giles. Multiple formats.

Wikisource: Historia Brittonum, Latin text. History of the Britons, English text, translated by W. Gunn & J. A. Giles. HTML format.

Yale Law School Avalon Project: History Of The Britons, translated by J. A. Giles.

Other Resources

Internet Archive: Nennius vindicatus. Über entstehung, geschichte und quellen der Historia Brittonum, by Heinrich Zimmer (1893). German language commentary.

Librivox: History of the Britons - public domain audiobook.

Wikipedia: Nennius - Historia Brittonum.

The Great Conversation: Further reading at Tom's Learning Notes

Gildas: On the Ruin and Conquest of Britain.

Bede: The Ecclesiastical History of the English People.

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