| William De Roos Baron Roos, Of Belvoir III | |
| B: | Between 1250 and 1255 |
| Yorkshire, England | |
| D: | 15 Aug 1316 |
 | Maud De Vaux Abt 1244-Yes, date unknown |
| Maud De Vaux | |
| B: | Abt 1244 |
| M: | 1287 |
| D: | Yes, date unknown |
| Isabel De Albini Abt 1223-1301 |
| Isabel De Albini | |
| B: | Abt 1223 |
| Of Belvoir Castle, Leicestershire | |
| D: | 15 Jun 1301 |
| Robert De Roos Baron Roos, Of Belvoir IV Abt 1223-1285 |
| Robert De Roos Baron Roos, Of Belvoir IV | |
| B: | Abt 1223 |
| Belvoir | |
| M: | 5 Jun 1243 |
| D: | 17 May 1285 |
| Kirkham, England | |
| William De Albini Lord Belvoir | |
| B: | Of Belvoir Castle, Leicestershire |
| M: | Aft 1236 |
| D: | 1247 |
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