William de Forz Count of Aumale( - 29 Mar 1241) Baldwin III de Riviers (or Vernon) Earl of Devon(ca 1216 - 15 Feb 1245)
Aveline de Montfichet( - ca Nov 1239) Amicia de Clare(27 May 1220 - bef 21 Jan 1284)
m. ca 1249
William de Forz Count of Aumale Isabel Riviers (or Vernon) Countess of Devon
b.  
d. 23 May 1260, Amiens
Claimant to be earl of Chester - but reserved to crown.
b. Jul 1237
d. 10 Nov 1293, Stockwell, Surrey
1st dau. dsps. De jure, 8th countess.
Spouses: 1, 2
Children
Thomas de Forz Count of Aumale(9 Sep 1253 - 6 Apr 1269)
Aveline de Forz Countess of Aumale(20 Jan 1258 - 10 Nov 1274)
Avice de Forz( - bef 6 Apr 1269)