nest ferch rhys ap tewdwr was the daughter of the last king of south wales by his wife, gwladys ferch rhiwallon ap cynfyn of powys. their grandchildren, maurice fitzgerald, lord of lanstephan, raymond le gros and philip de barry were leaders in the norman invasion of ireland. nest's son by her second marriage, robert fitzstephen, was another participant, as was william de hay, husband of one of gerald's and nest's granddaughters. nest's grandson (through her son by henry i of england), meiler fitzhenry, was appointed lord justice of ireland for his cousin, henry ii. the most renowned of gerald's and nest's grandchildren, gerald of wales, gave an account of the norman invasion, as well as lively and invaluable descriptions of ireland and wales in the late 12th century.