Nennius biography of george
Vortigern Studies Index
| 'Nennius'- Historia Brittonum ( ca AD 829) Robert Vermaat |
The Historia Brittonum is the single most important source for Vortigern.
Nennius - Wikipedia
It describes for the first time the full background of the invitation to the Saxons, at least as it was perceived at the time of writing, in the 9th century. As a result of e new interest in British history, the questions as to the how and why of the current English domination led to a new interest in Vortigern at the same time.
However, most of what we get to see is purely legendary.
Manuscripts and date
A transcript of the relevant chapters can be found at this site.
It has become clear that all MSS of the Historia Brittonum are different enough from each other, as well as from the later Welsh Bruts and the Historia Regum Britanniae of Geoffrey of Monmouth, to be seen as very late but original version of an independent Welsh tradition.
Unfortunately, all John Morris (historian) - Wikipedia JOGOF