Family: Sir Sir William de Ros, of Helmsley / Lucy Brecknock FitzPiers (fam02110)
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 | Sir Sir Robert De Ros, II (1172-1227)
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 | Princess Princess Isabel of Scotland (1165-1196)
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| Lucy de Ros (1193-1292) |
| Robert de Ros, of Wark III (1195-1269)  |
| Earl Earl Hugh of Ross (1200- ) |
| Isabel de Roos (1227- ) |
| Peter Fitzherbert (1190-1235)
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| Alice de Warkworth FitzRoger (1200- )
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| Reginald FitzPiers (1235-1286) |
| Lucy Brecknock FitzPiers (1196-1266)
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| Sir Sir William de Ros, of Helmsley (1191-1264)
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| Sir Sir Robert De Ros, IV (1235-1285) |
| Sir Sir William De Ros, II (1240-1310) |
| Alice de Ros (1242-1286) |