1136 - 1164 (27 years)
 | William de Windsor, V 1230-Abt 1279 |
| William de Windsor, V | |
| B: | 1230 |
| Buckinghamshire, England | |
| D: | Abt 1279 |
| Buckinghamshire, England | |
 | Margaret Dorkenford Abt 1253-Abt 1300 |
| Margaret Dorkenford | |
| B: | Abt 1253 |
| Buckinghamshire, England | |
| M: | 1263 |
| D: | Abt 1300 |
| William de Windsor, IV 1189-1275 |
| William de Windsor, IV | |
| B: | Apr 1189 |
| Stanwell, Middlesex, England | |
| D: | Apr 1275 |
| Stanwell, Middlesex, England | |
| Agnes Tailbois 1193-1229 |
| Agnes Tailbois | |
| B: | 1193 |
| Buckinghamshire, England | |
| D: | 1229 |
| Grayrigg, Westmorland, England | |
| Edyth Plantagenet 1162-1189 |
| Edyth Plantagenet | |
| B: | 1162 |
| Cumberland, England | |
| D: | 1189 |
| London, England | |
| William de Windsor, III 1146-1194 |
| William de Windsor, III | |
| B: | 1146 |
| London, England | |
| M: | 1188 |
| Haccombe, Devon, England | |
| D: | 1194 |
| London, England | |
|
| Count William Poitou Plantagenet 1136-1164 |
| Count William Poitou Plantagenet | |
| B: | 22 Jul 1136 |
| Argentan, Orne, Basse-Normandie, France | |
| D: | 30 Jan 1164 |
| Rouen, Seine-Maritime, Haute-Normandie, France | |
 | Cecily FitzPayn 1127-1204 |
| Cecily FitzPayn | |
| B: | 1127 |
| Ewyas Harold, Herefordshire, England | |
| M: | 1155 |
| Herefordshire, England | |
| D: | 1204 |
| Hereford, Herefordshire, 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.
