| William de Forz Count of Aumale ( - 1241) |
Baldwin III de Riviers (or Vernon) Earl of Devon (ca1216 - 1245) |
| Aveline de Montfichet ( - ca1239) |
Amicia de Clare (1220 - <1284) |
| 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 |
| Thomas de Forz Count of Aumale Aveline de Forz Countess of Aumale Avice de Forz |