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http://en.wikipedia.org/wiki/Gruffydd_ap_Cynan

Gruffydd ap Cynan (also spelled Gryffydd ap Cynan) (c. 1055 – 1137) was a King of Gwynedd. In the course of a long and eventful life, he became a key figure in Welsh resistance to Norman rule, and was remembered as King of all Wales. As a descendant of Rhodri Mawr, Gruffydd ap Cynan was a senior member of the princely house of Aberffraw.
Through his mother Gruffydd had close family connections with the Danish settlement around Dublin and he frequently used Ireland as a refuge and as a source of troops. He three times gained the throne of Gwynedd and then lost it again before regaining it once more in 1099 and this time keeping power until his death. Gruffydd laid the foundations which were built upon by his son Owain Gwynedd and his great-grandson Llywelyn the Great.