William (2nd Earl of Cornwall) Count of Mortain
Bef 1084 - Yes, date unknown
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| Richard The Great (Lord of Connacht) De Burgh | |
| D: | 1243 |
| Giles De Lacy | |
| D: | Yes, date unknown |
| Una (Or Agnes of Connaught | |
| D: | Yes, date unknown |
| Hubert (Bishop of Limerick) De Burgh | |
| D: | Yes, date unknown |
| Richard The Younger De Burgh | |
| D: | Yes, date unknown |
| William De Burgh | |
| D: | 1205 |
| John (Sir) De Burgh | |
| B: | Abt 1210 |
| D: | Yes, date unknown |
| Hawyse De Lanvalay | |
| B: | Abt 1210 |
| D: | 1249 |
| Hubert (1st Earl of Kent) De Burgh | |
| D: | 12 May 1243 |
| Margaret De Arsic | |
| D: | Yes, date unknown |
| Isabel Countess of Gloucester | |
| B: | Bef 1176 |
| M: | 1217 |
| D: | 14 Oct 1217 |
| Margaret De Burgh | |
| B: | Aft 1222 |
| D: | Nov 1237 |
| Richard (2nd Earl of Gloucester) De Clare | |
| B: | 4 Aug 1222 |
| M: | 1232 |
| D: | 15 Jul 1262 |
| Margaret of Scotland | |
| B: | Abt 1193 |
| M: | 19 Jun 1221 |
| D: | 1259 |
| John De Burgh | |
| D: | Yes, date unknown |
|
| William (2nd Earl of Cornwall) Count of Mortain | |
| B: | Bef 1084 |
| D: | Yes, date unknown |