Baron William de Courcy
1072 - 1114 (42 years)
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| Earl of Ulster John de Courcy Bef 1150-Aft 1210 |
| Earl of Ulster John de Courcy | |
| B: | Bef 1150 |
| Somerset, England | |
| D: | Aft 1210 |
| Sir Jordan de Courcy 1195- |
| Sir Jordan de Courcy | |
| B: | 1195 |
| Jordan Teutonicus de Courcy 1161-1197 |
| Jordan Teutonicus de Courcy | |
| B: | 1161 |
| Islip, Oxfordshire, England | |
| D: | 1197 |
| Antrim County, Northern Ireland | |
| Jordan de Courcy 1129-1176 |
| Jordan de Courcy | |
| B: | 1129 |
| Islip, Oxfordshire, England | |
| D: | 1176 |
| Grimsby, Lincolnshire, England | |
|
| Baron William de Courcy 1072-1114 |
| Baron William de Courcy | |
| B: | 1072 |
| Somerset, England | |
| D: | 1114 |
| Somerset, England | |
 | Emma de Falaise 1076-1129 |
| Emma de Falaise | |
| B: | 1076 |
| Somerset, England | |
| M: | 1094 |
| Somerset, England | |
| D: | 1129 |
| England | |