The gentleman Percivale is refered to by two different names.
Nobody knows for sure.
He wants to open a car dealership, but lacks the funds. Apparently, he also lacks a realistic vision. Perhaps he was called King because he was considered to be the King of Drinking in Camelot. Before one of the more historic Arthurian battles, the entire Round Table gorged themselves on Vodka. In an hour, everyone was passed out except Percivale.