sentences:  Thomas's son John FitzMaurice FitzThomas, who was killed in the Battle of Callann, became the first Baron Desmond.Others from this line include the Knights of Glin and Knights of Kerry.Maurice FitzGerald was the second son of Gerald FitzWalter known as Gerald de Windsor, Constable of Pembroke Castle by his wife, Nest ferch Rhys, Princess of Deheubarth and a member of the Welsh royal House of Dinefwr.