daughter Alice (Adelize) de Clare and had issue with her.

Gruffudd ap Cynan died in 1137 and was succeeded by Owain Gwynedd, his eldest surviving son. Cadwaladr was given lands in northern Ceredigion. Cadwaladr joined with Ranulf de Gernon, 4th Earl of Chester in the attack on Lincoln in 1141, when King Stephen of England was taken prisoner. This alliance was probably linked