Mabel FitzWilliam of Gloucester, Countess of Gloucester, was born circa 1155 to William Fitz Robert, 2nd Earl of Gloucester (-1183) and Hawise de Beaumont (c1125-c1172) and died 1198 of unspecified causes. She married Gruffudd ap Ifor Bach (c1158-1211) . She married Amaury V de Montfort-Évreux (-c1182) 1170 JL . William I of England (1027-1087)/s.
|Offspring of Mabel of Gloucester and Gruffudd ap Ifor Bach (c1158-1211)|
|Nest ferch Gruffudd (c1174-)|
|Rhys ap Gruffudd (c1175-)|
|Hywel Felyn ap Gruffudd (c1179-).|
|Mawd ferch Gruffudd (c1181-)||1181 United Kingdom||Hywel ap Madog (c1180-)|
|Offspring of Mabel of Gloucester and Amaury V de Montfort-Évreux (-c1182)|
|Amaury VI de Montfort-Évreux (c1172-1213)|