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 | Earl of Clare Richard de Clare (1153-1217)
|
 | 1st Earl of Pembroke William Marshall, the Elder (1146-1219) |
| 4th Countess of Pembroke Isabella de Clare (1172-1220)
|
| Sibyl Marshall (1209-1245)  |
 | Countess of Cornwall Isabel Marshall (1200-1240)
|
| Eighth Earl of Clare, Sixth Earl of Hertford, 6th Earl of Gloucester Richard de Clare, IV (1222-1262) |
 | Isabel de Clare (1226-1264) |
We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
