The transformation of Roman Britain

[Agraes]

There was probably a power lack in the regions where the AS first settled. Romanised areas, with foederati charged of the defense for years and years. Part of the population would had already been germanised. In the West, it was different. In the North, the Brythonic elites were defeated because having spend more time fighting themselves. When Urien was killed, his allies rushed his kingdom, and the Bernicians recovered their strenght.