Brittonum

Bede, Ecclesiastical History, Book II, Ch. 5, from Sherley-Price's translation, p. 112. An alternative form of this genealogy, found in the Historia Brittonum among other places, reverses the position of Octa and Oisc in the lineage.

In the Historia Brittonum Hengist had an unnamed daughter (Historia Regum Britanniae first gave her name as Rowena ) who seduced Vortigern, eventually leading to the Treachery of the Long Knives when Hengist's men massacred the Britons at a peace accord.

On Uther's death, the fifteen-year-old Arthur succeeds him as King of Britain and fights a series of battles, similar to those in the Historia Brittonum, culminating in the Battle of Bath.

Problems have been identified, however, with using this source to support the Historia Brittonum's account.

Recent studies, however, question the reliability of the Historia Brittonum.

The 9th-century Historia Brittonum also refers to this tale, with the boar there named Troy(n)t.

The ninth century Historia Brittonum gives another account of Maximus and assigns him an important role: The seventh emperor was Maximianus, (One of a great many confusions and conflations on Geoffrey's part).

While the Historia ecclesiastica gentis Anglorum and the Anglo-Saxon Chronicle refer to the brother as Horsa, in the Historia Brittonum his name is simply Hors.