Research Notes:

He (Morgan ap Owain) was followed by his brother, Iorwerth ab Owain. In 1171 Iorwerth, somehow, fell under the king's displeasure, and lost Caerleon. When (1172) it seemed that the two were once more coming to terms, Iorwerth's son, Owain, was killed by the earl of Gloucester's men, and Iorwerth, with his surviving son Hywel, blazed out against the king and the Normans. Taking advantage of the great 'rebellion' of 1173, they seized Caerleon and other castles in Gwent; and though they had lost these castles by 1175, their friendship with the 'lord' Rhys availed them to induce the king to return Caerleon to them; in 1184-5 Hywel was one of the six men who held castles in Glamorgan and Gwent in the king's name. ²