
1) British traditional history 2) Legendary British king
Found on
https://www.crosswordclues.com/clue/guithelin

Guithelin was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He became king after the death of Gurguit Barbtruc. He ruled liberally and temperately for his life. His Queen consort was an artisan and noblewoman named Marcia. When he died, his wife took over the government as regent for their son, Sisillius II. She came to rul...
Found on
http://en.wikipedia.org/wiki/Guithelin
No exact match found.