Database: Britons

Hostile to both Saxons and the Norse, the Britons come from a cluster of kingdoms along England's western border that would coalesce to become modern Wales. Because of their independent spirit and distinctive language, the Britons were often in conflict with both Mercia and Wessex. During the 8th century, King Offa of Mercia established a border in the form of a long earthwork.

More like a ditch, really.

In the 9th century, Rhodri ap Merfyn rose to assimilate several other kingdoms in the nascent step to forming Wales, thus becoming known as King of the Britons. His nimble forces countered both Mercian and Viking invaders.