Welsh History

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.

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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.

Latin Library: Historia Brittonum. Latin text. HTML format.

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.

Gildas - On the Ruin and Conquest of Britain

Gildas' De Excidio et Conquestu Britanniae (On the Ruin and Conquest of Britain) is a unique document of post-Roman Britain. Probably composed some time in the sixth century, it is not so much a work of history, as a polemic against various sub-Roman kings, whose impiety and misrule is blamed for the misfortunes of the Britons and the conquests of the Anglo-Saxons. The paucity of documents from this disturbed period of British history mean it is nevertheless an invaluable source.  

Free online texts

Heroofcamelot.com: Gildas' On the Ruin of Britain, translated by J.A. Giles and T. Habington. Creative Commons PDF file.

Gutenberg: On the Ruin of Britain, translated by J.A. Giles. Multiple formats.

Internet Archive: Gildas: The Ruin of Britain, Fragments from Lost Letters, the Penitential, together with the Lorica of Gildas.  Edited for the Hon. Society of Cymmrodorion by Hugh Williams (London, 1899). Latin and English, multiple formats.

Internet Archive: The works of Gildas and Nennius, translated by J.A. Giles (1841). Multiple formats.

KMatthews.org.uk: Gildas de excidio et conquestu britanniae. Latin text, HTML files.

Tertullian.org: The Ruin of Britain, English text edited (translated?) by Hugh Williams (1899). 

Wikisource: The Ruin of Britain (6th century), by Gildas, translated by Thomas Habington and John Allen Giles. HTML file with PDF/EPUB/MOBI downloads.

Other Resources

Internet Archive: Of the Ruin of Britain (De excidio Britanniae) - public domain audiobook.

Internet History Sourcebook: The Life of Gildas, by Caradoc of Llangfarn.

Wikipedia: Gildas - De Excidio et Conquestu Britanniae.

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

Bede: Ecclesiastical History of the English People - relies heavily on Gildas as a source on the Anglo-Saxon invasions.

Nennius: History of the Britons.