Gruffydd ap Llywelyn (c. 1196–1244) He was Llywelyn's eldest son. He married Senena, daughter of Caradoc ap Thomas of Anglesey. Their sons included Llywelyn ap Gruffudd, who for a period occupied a position in Wales comparable to that of his grandfather, and Dafydd ap Gruffydd who ruled Gwynedd briefly after his brother's death.
Dafydd ap Llywelyn, Llywelyn ap Iorwerth's son and heir, attempted to broaden Welsh power before his premature death in 1246. With Dafydd leaving no heirs, succession to the Welsh throne was contested by Dafydd's nephews and in a series of battles between 1255 and 1258 Llwelyn ap Gruffydd (d.
The new church had only a short life, for it was plundered and burnt in 1056 by a combined force of Welsh and Irish under Gruffydd ap Llywelyn, the Welsh prince; it was not, however, destroyed until its custodians had offered vigorous resistance, in which seven of the canons were killed.
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