Cadwaladr

Cadwaladr ap Cadwallon (English: Cadwaladr son of Cadwallon, also Cadwallader or Cadwalader) was King of Gwynedd (reigned c. 655 – 682). Two devastating plagues happened during his reign, one in 664 and the other in 682, with himself a victim of the second one. Little else is known of his reign. Cadwaladr is most widely recognised as a prominent character in the romantic stories of Geoffrey of Monmouth, where he is portrayed as the last in a line of legendary kings of Britain.