1080 - 
| Sir William Sydney | |
| B: | 1389 |
| Surrey, England | |
| D: | Aft 1428 |
| Kingham, Oxfordshire, England | |
| Cecily Mitchell | |
| B: | 1385 |
| Penhurst, Sussex, England | |
| M: | Abt 1420 |
| Penshurst, Kent, England | |
| D: | 1446 |
| Penshurst, Kent, England | |
| William Sydney | |
| B: | 1355 |
| Penhurst, Sussex, England | |
| D: | 31 May 1428 |
| Denmark | |
| Alicia Clumford | |
| B: | 1355 |
| Penhurst, Sussex, England | |
| D: | 5 Sep 1395 |
| England | |
| William Sidney | |
| B: | 1325 |
| Lewes, Sussex, England | |
| D: | 1355 |
| Lewes, Sussex, England | |
| Johanna Brokhull | |
| B: | 1325 |
| Penhurst, Sussex, England | |
| M: | 1354 |
| Lewes, Sussex, England | |
| D: | 1355 |
| Sussex, England | |
| John Sidney | |
| B: | 1300 |
| Lewes, Sussex, England | |
| D: | 1325 |
| Sussex, England | |
| Helen Batisford | |
| B: | 1300 |
| Ashburnham, Sussex, England | |
| M: | Lewes, Sussex, England |
| D: | 1325 |
| Sussex, England | |
| William Sidney | |
| B: | 1276 |
| Sussex, England | |
| D: | 1300 |
| Sussex, England | |
| Elizabeth Ashburnham | |
| B: | 1277 |
| Ashburnham, Sussex, England | |
| M: | England |
| D: | 1300 |
| Sussex, England | |
| Henry Sidney | |
| B: | 1236 |
| Lewes, Sussex, England | |
| D: | 1276 |
| England | |
| Mary Hussey | |
| B: | 1255 |
| Lewes, Sussex, England | |
| M: | 1276 |
| D: | 1315 |
| Sussex, England | |
| Sir Henry Sidney | |
| B: | 1190 |
| Lewes, Sussex, England | |
| D: | 1268 |
| Lewes, Sussex, England | |
| Maud d'Abernon | |
| B: | 1205 |
| Stoke D'Abernon, Surrey, England | |
| M: | 1224 |
| Sussex, England | |
| D: | 1265 |
| England | |
| Sir Roger Sidney | |
| B: | 1170 |
| Suffolk, England | |
| D: | 1239 |
| Lewes, Sussex, England | |
| Lady Eleanor Stopham | |
| B: | 1170 |
| Lewes, Sussex, England | |
| D: | 1200 |
| Lewes, Sussex, England | |
| Margaret de la Mare | |
| B: | 1150 |
| Childrey, Berkshire, England | |
| D: | 1177 |
| Lewes, Sussex, England | |
| Symon Sidney | |
| B: | 1145 |
| Suffolk, England | |
| M: | Abt 1169 |
| Lewes, Sussex, England | |
| D: | 1213 |
| England | |
| Thomas de la Mare | |
| B: | 20 Nov 1116 |
| Yorkshire, England | |
| D: | 1178 |
| Epsom, Surrey, England | |
| Margaret de Ashstead | |
| B: | 1125 |
| Epsom, Surrey, England | |
| M: | 1139 |
| Yorkshire, England | |
| D: | 1152 |
| Epsom, Surrey, England | |
| William de la Mare | |
| B: | 1095 |
| Guisborough, Yorkshire, England | |
| D: | 1140 |
| Yorkshire, England | |
| Amabel de Dicton | |
| B: | 1098 |
| Yorkshire, England | |
| M: | 1121 |
| D: | Yorkshire, England |
| Beatrice de la Mare | |
| B: | 1080 |
| Yorkshire, England | |
| D: | England |
| Alan de la Mare | |
| B: | 1070 |
| Yorkshire, England | |
| D: | 1120 |
| Yorkshire, England | |
We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
