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In page Gruffydd ap Llywelyn:

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Gruffydd married Ealdgyth,[citation needed] daughter of Earl Ælfgar of Mercia after he abducted, and marriage to, the wife, name unknown, of Hywel ab Edwin in 1041.[1] Gruffydd had at least three children: two sons called Maredudd and Idwal,[2] both of whom died at the Battle of Mechain in 1069,[1] and a daughter, Nest ferch Gruffydd, who married Osbern fitzRichard of Richard's Castle.[2][3] Their daughter Nest ferch Osbern (Nesta of Hereford) married Bernard de Neufmarché. Gruffydd may have had another son, Owain ap Gruffudd, who died in 1059.[1]