Sub-Roman Britainball was a period between Roman Britainball and Anglo-Saxonballs. The mythical King Aurthur was supposedly one of the kings.
Kingdoms
Berniciaball
Dumnoniaball
Kingdom of Dyfedball
Ergyngball
Kingdom of Gwentball
Kingdom of Glywysingball
Kingdom of Powysball
Kingdom of Gwyneddball
Elmetball
Rhegedball
Ebraucball
Kingdom of Strathclydeball
Gododdinball