Cador () is a legendary Duke of Cornwall, known chiefly through Geoffrey of Monmouth's pseudohistorical Historia Regum Britanniae and previous manuscript sources such as the Life of Carannog. In Welsh genealogical records, he appears as Cado (), the son of Cornish king Geraint. Early sources present him as a relative of King Arthur, though the details of their kinship are usually left unspecified.
Historicity
Many stories involving Arthurian figures were told orally, leading to many interpretations and versions of the people, events, and characters. Scholars question the historical accuracy of these tales and most have been discredited, so the people associated with him could conceivably have been added by later storytellers.
One such figure was Arthur's close associate Cador, successor to Geraint ab Erbin, described by genealogist Peter Bartrum as "perhaps the invention of Geoffrey of Monmouth." According to legendary accounts, Cador the Duke of Cornwall was summoned to Arthur's court and may have been a real historical figure, but the diversity of interpretations and stories that include him make it difficult to understand his true context. According to the book King Arthur: The Truth Behind the Legend Arthurian events mix fact and fiction, and while many people and events could not have been real,