Helen ferch Daffyd Peerage person ID=127280 Parents Dafydd ap Llywelyn Isabella de Braose Children Alexander of Mar Gartnait, Earl of Mar Isabella of Mar Margaret of Mar Duncan of Mar Siblings Llywelyn ap Dafydd, Constable of Rhuddlau Tangwystl ferch Dafydd Llywarch ap Dafydd ap Llywelyn Annes ferch Dafydd ap Llywelyn ap Iorwerth Dafydd ap Dafydd ap Llywelyn Partners Domhnall I, Earl of Mar Máel Coluim II, Earl of Fife