The following internet sites contain material relevant to Britonia:
The gateway to Christopher Snyder's online Gazetteer of sub-Roman Britain.
A useful list of early medieval Insular Sources.
Celtic Studies Association of North America.
An online early Medieval journal.
A site dedicated to the study of Vortigern.
For books on early Medieval Britain and Ireland.
If you know of a site which you would like to see here, please get in touch.