Eagles Have Flown
King of Mid-South Wales (Cernyw)
Although many later Welsh kings claimed descent from Magnus Maximus in order to legitimise and enhance their own status, Owain Finddu has one of the better claims, and his territory seems to have been created to plug a gap between South Wales and Ewyas.
The kingdom of Cernyw emerged from this with Owain’s son, and was renamed after Owain’s great-grandson as Glywyssing. Even later, in the tenth century, it was again renamed after one of its most powerful late rulers as Morgannwg, and is remembered as today’s Glamorgan region.
from Kessler, P. L. (2007, September 8). Post-Roman Britain: Early Independent Britain AD 400-425. Retrieved from http://www.historyfiles.co.uk/FeaturesBritain/BritishMapAD400.htm