CADWALADR ap CADWALLON
Would this be of assistance " Clarkey " source: from my own research
Cadwaladr ap Cadwallon was a real person. His father, Cadwallon, was killed in the battle of Catscaul or Cad-ys-gual, the Battle of the Wall (Heavenfield, near Hexham) in 634 AD. An unknown usurper, Cadfael ap Cynfeddw, placed himself on the throne of Gwynedd, and was himself overthrown in 655 AD by the twenty-two year old Cadwaladr, Cadwallons son, whod been raised in exile until he could return to claim his birthright.
Cadwaladr is mentioned in the following sources:
The Harlaein Genealogies: a collection of old Welsh genealogies preserved in British Library, Harleian MS 3859. Theyve been dated to the reign of Hwyel Dda (10th century). Cadwaladr is mentioned as the son of Cadwallon and the father of Idwal, all Kings of Gwynedd.
Annales Cambriae (the Annals of Wales): A single line: 682 A great plague in Britain, in which Cadwaladr son of Cadwallon dies.
Historia Brittonum: This text was composed sometime between 828 and 830, attributed to Nennius. Of Cadwaladr ap Cadwallon, he states: Catgualart (Cadwallader) was king among the Britons, succeeding his father, and he himself died amongst the rest. He slew Penda in the field of Gai, and now took place the slaughter of Gai Campi, and the kings of the Britons, who went out with Penda on the expedition as far as the city of Judeu, were slain.
Till we meet again -Regards - edmondsallan