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According to William of Worcester, writing in the fifteenth century, Cadoc was a survivor of the Cornish royal line at the time of the Norman Conquest of England in 1066 and was appointed as the first Earl of Cornwall by William the Conqueror. His date of death is not known, but a prince named Hywel of Cornwall (who is likely to have come from Cornouaille in western Brittany but may have descended from the line of Cornwall in Britain and is described as Count of Cornwall) inherited the throne of Brittany through marriage to Havise, heiress of Brittany in 1066. He ruled Brittany alone from 1072, dying in 1084. He was succeeded by his son and then his grandson. His last descendant, a great-grandson also called Hoël, died disinherited in 1156. There were two other patrilineal descendants of this line whose children are not recorded which allows for the possibility that the line endured (see Kings and dukes of Brittany family tree).
