Family: Robert IV, 1ST Baron DE Ros, OF BELVOIR,MP / Isabel de Albini, Heiress of Belvoir (F847)
m. 1243/1244
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![Lucia [Joan] Fitzpiers, Baroness of Ingmanthorpe](img/female.jpg){kind=small} | Lucia [Joan] Fitzpiers, Baroness of Ingmanthorpe (1183-1267) |
| Lucy de Ros (1230-1279)  |
| Dorothea de Ross (1238- ) |
 | William 11 De Ros, Brn Ingmanthorpe,sir (1244-1310) |
| Anne Rosse (1246- ) |
| Mary de Ros, Baroness of Brewose (1249- ) |
| William De Albini III Lord Belvoir (1209-1285) |
| ALBREDA BISETH (1200- )
|
| Robert IV, 1ST Baron DE Ros, OF BELVOIR,MP (1233-1285)
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| Isabel de Albini, Heiress of Belvoir (1233-1301)
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| William De Ros III Baron Ros (1255-1316) |
| Mary De Ros, [BARONESS BREWOS (1253-1326) |
| JOAN DE Roos (1256-1348) |
| Isabel de Ros (1256-1309) |
| John de Ros (1275- ) |