Father | MaleDEROS, Peter Piers 1st Baron of Hamlake |
| Born | Between 1088 and 1100 | Holderness, Yorkshire, England |
| Died | 1157 | Rievaulz Abbey, Yorkshire, England |
| Buried | ||
| Married | ||
| Father | DEROS, Sir Malcolm Baron | F5613 Group Sheet | |
| Mother | DE BALLIOL, Euphemia | F5613 Group Sheet | |
Mother | FemaleD'ESPEC, Adeline Heiress De Helmsley |
| Born | 1092 | Old Warden, Bedfordshire, England |
| Died | 1155 | Helmsley, Yorkshire, England |
| Buried | ||
| Father | D'ESPEC, William Lord of Helmsley | F2660 Group Sheet | |
| Mother | DE BEAUCHAMP, Lady Adeline Baroness Helmsley | F2660 Group Sheet | |
Child 1 | MaleDE ROS, Sir Robert 2nd Baron of Hamlake Lord of Holderness |
| Born | 1115 | Helmsley, Yorkshire, England |
| Died | 1163 | Holderness, Yorkshire, England |
| Buried | ||
| Spouse | DE VALOGNES, Sibyl Ponthieu | F939 | |
| Married | ||
Child 2 | MaleDE ROSS, Everard |
| Born | 1120 | Wark, Northumberland, England |
| Died | 1176 | Yorkshire, England |
| Buried |
Child 3 | MaleDE ROS, Gilbert |
| Born | 1128 | Edlington, Yorkshire, England |
| Died | 1208 | Yorkshire, England |
| Buried |
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