I'm not sure that someone with a name like that would appreciate being called British.
Kennewick Man, Red Headed Paleo-American remains found in Nevada and Viking Runes and maps. Sounds like white guys were moving around earlier that I learned in school.
Yup, did you see these guys in Florida?
European DNA Found In 7-8,000 Year Old Skeleton In Florida (Windover)
I don’t see how you can call him anything OTHER than british.
The land was called Britannia by the Romans. That’s how it stayed until the formation of England in the 700s. If prince madoc lived in 500s, then he was truly a Briton
British as in Ancient British. Celtic, as opposed to Anglo-Saxon “English”.