1173 - Bef 1226 (< 56 years)
| 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 |
| Robert De Roos Baron Roos, Of Belvoir IV Abt 1223-1285 |
| Robert De Roos Baron Roos, Of Belvoir IV | |
| B: | Abt 1223 |
| Belvoir | |
| D: | 17 May 1285 |
| Kirkham, England | |
| Isabel De Albini Abt 1223-1301 |
| Isabel De Albini | |
| B: | Abt 1223 |
| Of Belvoir Castle, Leicestershire | |
| M: | 5 Jun 1243 |
| D: | 15 Jun 1301 |
| Ivetta (Juetta) De Roos Abt 1290-Bef 1331 |
| Ivetta (Juetta) De Roos | |
| B: | Abt 1290 |
| Igmanthorp, Yorkshire, England | |
| D: | Bef 1331 |
| Geoffrey Le Scrope 1281-1340 |
| Geoffrey Le Scrope | |
| B: | Between 1273 and 1281 |
| Masham, Yorkshire, England | |
| D: | Dec 1340 |
| William De Roos Abt 1244-Bef 1310 |
| William De Roos | |
| B: | Abt 1244 |
| Ingmanthorpe, Yorkshire, England | |
| D: | Bef 28 May 1310 |
| Eustace Fitzhugh Abt 1268-Yes, date unknown |
| Eustace Fitzhugh | |
| B: | Abt 1268 |
| Ingmanthorpe, Yorkshire, England | |
| D: | Yes, date unknown |
| William De Roos, I Of Hamlake 1193-Abt 1264 |
| William De Roos, I Of Hamlake | |
| B: | Between 1192 and 1193 |
| Helmsley, Yorkshire, England | |
| D: | Abt 1264 |
| Kirkham, England | |
| Lucia Fitzpiers, Of Brecknock Abt 1196-Aft 1266 |
| Lucia Fitzpiers, Of Brecknock | |
| B: | Abt 1196 |
| Helmsley, Yorkshire, England | |
| D: | Aft 1266 |
|
| Robert "Furfan" De Roos 1173-Bef 1226 |
| Robert "Furfan" De Roos | |
| B: | Between 1170 and 1173 |
| Helmsley, Holderness, Yorkshire | |
| D: | Bef 23 Dec 1226 |
| Of Helmsley, Holderness, Yorkshire | |
| Isabella Avenal, Of Scotland Abt 1165-Yes, date unknown |
| Isabella Avenal, Of Scotland | |
| B: | Abt 1165 |
| Scotland | |
| M: | 1191 |
| Haddington | |
| D: | Yes, date unknown |
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