Her maternal grandparents were Roger de Quincy, 2nd Earl of Winchester, and Helen of Galloway.
Elizabeth was married first to William Marshal, 2nd Baron Marshal, and after his death to Dafydd ap Gruffydd, a prince of Gwynedd and brother of Llywelyn ap Gruffudd.
[1][2] Dafydd was at that time in favour with King Edward I of England, but later rebelled and was executed in 1283.
Elizabeth's daughter Gwladys was sent to Sixhills convent for the rest of her life.
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