| Maurice Berkeley Lord of Berkeley |
William (III) de Ferrers Earl of Derby |
| Isabella FitzRoy |
Margaret de Quency |
| Thomas II Berkeley Lord Berkeley | Joan de Ferrers |
| b. 1245, Berkeley Castle, Clos d. 23 Jul 1321, Berkeley castle, Glos . Of Berkeley, Glos. 1st baron by writ. Kt: 1 July 1277. Vice-Constable of England. |
b. ca 1248, Derbyshire d. 19 Mar 1310, Berkeley Castle, Clos . |
| > Maurice Berkeley Lord Berkeley < Sir Thomas Berkeley Sir John Berkeley James Berkeley Bishop of Exeter Isabel Berkeley Margaret Berkeley |