Cador, Duke of Cornwall, appears in Geoffrey of Monmouth's
Historia Regum Britanniae (ca. 1135). He is a man of power, referred to as both a duke () and a king (). He is best known for his heroism in the battles of York and
Isle of Thanet, recounted in the
Historia Regum Britanniae. The historicity of Cador's involvement in these wars is still questioned by scholars. He won both battles, easily defeating the army in York and also killing Chelric, the leader of the Saxons, on the Isle of Thanet. Arthur's most successful siege, the
Battle of Badon, precedes the battle at the Isle of Thanet, which seems strangely illogical given the timeline. Because no Saxon or British historians note any battle in that region before the sixth century, this battle could plausibly have been completely fabricated for literary purposes. Cador also had three brothers named Cyngar, Iestyn, and Selyf, all saints of
Llancarfan; they are mentioned as related to Cador in the
Myvyrian. In addition to his brothers, he had a sister named Gurguint who married Caradoc Vreichfas, a legend of Welsh prehistory who lived at same time period as Arthur. According to Geoffrey, Cador married a woman named Ygerna (
Igraine), who was courted and seduced by Arthur's father
Uther Pendragon while Cador was away at war. Cador is thought to be related to Arthur because in different texts he is addressed as such.
Layamon, an English poet, wrote that Arthur said, "Cador, thou art mine own kin." However, some works say that Cador's son Constantine was Arthur's cousin, making Cador possibly an in-law rather than a blood relative. In Geoffrey's
Historia and elsewhere, Arthur's future queen
Guinevere is said to have been raised as Cador's ward. Cador is also said to be of Roman stock. His son Constantine was given the
kingship of Britain by Arthur as he lay ailing on the field of
Camlann. In the
Brut Tysilio, the translator adds that Cador was the son of
Gorlois, presumably by Igraine, which would make him Arthur's maternal half-brother. The same text also gives Cador a son, Mayric, who dies fighting the Romans. This story appears in Richard Hardyng's
Chronicle which refers to Cador as Arthur's brother "of his mother's syde." In
Layamon's Brut, Cador appears as a leader who takes charge of Uther's host when it is attacked by Gorlois as Uther secretly lies with Igraine in
Tintagel. Most of the later works, such as the English
Alliterative Morte Arthure and
Thomas Malory's ''
Le Morte d'Arthur'', however, refer to Cador as Arthur's cousin, though in the
Alliterative text, Arthur calls him his sister's son.
William Worcester travelled to Cornwall in 1478 and recorded in his
Itineraries that "Tador Duke of Cornwall, husband of the mother of Arthur was slain" at
Castle an Dinas. and is generally interpreted as a conflation of Cador with Gorlois (the husband of Igraine in
Historia Regum Britanniae), but likely reflects a local tradition, as the
Historia is the only authority for Gorlois as Igraine's husband. In
The Dream of Rhonabwy, a medieval romance associated with the
Mabinogion, Cador is "Cadwr Earl of Cornwall, the man whose task it is to arm the king on the day of battle and conflict" – i.e. at the Battle of
Badon Hill, which the writer situates close to the upper
River Severn. == Notes ==