Arthurian Links
- International Arthurian Society - North American Branch
- International Arthurian Society - British Branch
- Vortigern Studies, Dark Age British Earthworks
- Vortigern Studies, Ditches, Buckles, a Bosnian End to Roman Britain
- Vortigern Studies, The Vergilius Romanus
- Arthurian Resources
- The Camelot Project
- Britannia Internet Magazine
Some of the material contained in the above and other sources relevant to the period may need to be re-assessed in the light of what Catumandus' Epic has now revealed to us.