Bartrum's "Welsh Genealogies". The kingdoms of Gwynedd and Powys had been ruled by HYWEL THE GOOD (RIN 1436) from 942, when Meurig's, father, Idwal had been slain by the English until his (HYWELL's) death in 950. In that year, the kingdoms were restored to Meurig. He ruled until his death in 986. Upon his death, the kingdoms were put under the rule of HYWELL's grandson, MAREDUDD ap OWAIN.