Historia Britonum: Latin text of Nennius's history of the British people. Edited by Theodore Mommsen.Medieval Sourcebook: Nennius, Historia Brittonum: Complete text from the Giles translation and other sources.Nennius, The Indiscriminate Chronicler: Short biography by Tom J Rees of the 9th-century Celtic historian, describing his works and comparing him to an Anglo-Saxon counterpart, the Venerable Bede.