Family: 5th Earl of Hertford, 6th Earl of Gloucester Richard De Clare / Countess of Lincoln Maud De Lacy (F5229)
 | 4th Earl of Hertford Gilbert De Clare (1180-1230) 
|
Isabel Marshal (1200-1240)
|
| Agnes De Clare (1218- ) |
| Amice De Clare (1220-1287) |
| William De Clare (1228-1258) |
 | Gilbert De Clare (1229- ) |
Lady Isabella De Clare (1226-1264)  |
| 1st Earl of Lincoln John De Lacy (1192-1240)
|
| Countess of Lincoln Margaret De Quincy (1206-1266)
|
| Countess of Lincoln Maud De Lacy (1223-1289)
|
| 6th Earl of Hertford Gilbert De Clare (1243-1295) |
| Isabel De Clare (1240-1270) |
| Thomas De Clare (1245-1287) |
| Bogo De Clare (1248-1294) |
| Margaret De Clare (1250-1312) |
| Rohese De Clare (1252- ) |
| Eglentina De Clare ( -1257) |
