Cadwaladr ap Cadwallon was king of Gwynedd in Wales from around 655 to 682 AD. Two devastating plagues happened during his reign, one in 664 and the other in 682; he himself was a victim of the second. Little else is known of his reign.
Stained glass window depicting Cadwaladr in Llandaff Cathedral (Charles Powell, 1919)
Cadwaladr depicted in a manuscript (Peniarth MS 23) of Brut y Brenhinedd, the Welsh translation of Geoffrey's Historia Regum Britanniae, dating from before the end of the 15th century
The Kingdom of Gwynedd was a Welsh kingdom and a Roman Empire successor state that emerged in sub-Roman Britain in the 5th century during the Anglo-Saxon settlement of Britain.
Medieval kingdoms of Wales
Bryn Eryr, recreation of pre Roman roundhouse, it's a 2,000-year-old Celtic Iron Age home.
Kingdom of Gwynedd c. 620
Gravestone of Cadfan ap Iago, father of Cadwallon ap Cadfan