Gruffydd ap Llywelyn, King of Gwynedd
Gruffydd ap Llywelyn (c. 1010 – 5 August 1063) was King of Wales from 1055 to 1063. He had previously been King of Gwynedd and Powys in 1039. He was the son of King Llywelyn ap Seisyll and Angharad daughter of Maredudd ab Owain, and the great-great-grandson of Hywel Dda.