who died May 21, 542 A.D., gave his crown to Constantine who was the son of Cador the Duke of Cornwall noting the possible time period and years in which Cador could have lived. Name The name “Cador” does not match any early Welsh sources, so the name itself comes either the misinterpretation of the Harley genealogy name “Catgur” or the British “Catigern”. Both names are interpreted similarly showing that the name Cador means "battle notable" or "fighter" due to the fact that “Cat” means battle and “Gur” means man or warrior while “Tigern” means leader. Where the name Cador came from is a mystery due to the fact that it is not found in early Welsh sources, but it was very easy for letters to be dropped out of “Catgur” or “Catigern” causing the name Cador to be formed. Cador, who was mainly mentioned by Geoffrey of Monmouth, has also been called/recognized by two other names: Cado and Cadwy in different works like Myvyrian, Life of S. Carannog, and early fifteenth century pedigrees. His title Duke of Cornwall was also a title that took on different forms over history because Cornwall was once a part of the Roman civitas Dumnonia, giving Cador the name King of Dumnonia which is recognizable in many works. Origins and relations Cador was reputed to be the son of Geraint ( Latin Gerontius, Cornish Gerrens ) who was a King of Dumnonia and a historic hero that died quite early leaving his rule to Hoel because Cador was not at a proper age for leadership. He was known to have children himself who go by the names Constantine (Welsh Custennin) Peredur, and Cadoc. He had shared lineage with King Arthur due to the fact that he was the great grandson of Arthur's Duke, based on the idea of Custennyn and Constantine genealogies being equivalent to each other. Cador also had three brothers by the names of Cyngar, Iestyn, and Selyf who are all saints of Llancarfan and are mentioned to be related to Cador in the Myvyrian. Along with his brothers, Cador was known to have a sister named Gurguint who was married to Caradoc Vreichfas who was a legend in Welsh history and was alive during the same time period as Arthur. Many historians believe Caradoc Vreichfas to be synonymous with Cerdic of Wessex, the Anglo-Saxon founder of the House of Wessex and