Historia Brittonum, which is a history of the Celtic Britons written in north Wales in 829–30, claims that the Celtic Britons were descended from Trojans from the ancient city of Troy, who were the first to settle on the island of Britain. It is also claimed in Historia Brittonum, as well as Historia Regum Britanniae by Geoffrey of Monmouth, that the first king of the Britons was Brutus of Troy and that the island of Britain was named after him.
