Family: William De Ros, Lord of Helmsley / Lucy Fitzpeter (F920)
m. 1225
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 | Robert De Ros, I (1170-1226) |
 | Isabella Dunkeld (1170-1240)
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| Piers Fitz Herbert, Lord Of Brecknock (1185-1235)
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| Alice De Warkworth (1185-1224)
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| Reginald Fitzpiers, Lord of Blenlevenny (1208-1286)  |
| Lucy Fitzpeter (1204-1267)
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| William De Ros, Lord of Helmsley (1192-1258)
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| Robert Ros, 4th Baron Hamlake (1237-1285) |
| William De Ros of Ingmanthorp, Baron De Ros , II (1244-1310) |