King Arthur prequel!
Excerpt from priest's court log, Aberffraw:
"I am Arthur, son of King Uthr of the Pecsa. I pledge my loyalty in all things until such time as I am able to return to my homeland and avenge my father."
The boy is scrawny but forthright. I would wager he would have made an excellent holy man, and he will make for a terrifying king if he ever carves out a kingdom.