Corineus

Corineus, or Corin, eponymous founder of Cornwall, was descended from the heroes of the Trojan War, and was one of the companions of Brutus of Britain, and is spoken of in Geoffrey of Monmouth's Historia Regum Britanniae. He slew the giant Gogmagog near Plymouth, and for this feat was rewarded with possession of the southwestern horn of Britain, which from then after was called "Corinea" or "Cornovia." The tale is preserved in the works of later writers, including Michael Drayton and John Milton, but later historians deem Corineus the Trojan to be a wholly legendary figure.