Nielsen Hayden genealogy
Family: Gasce de Poissy / Constance de Courtenay (F15313)
Pierre of France (1121-1180) 
|
Elisabeth de Courtenay ( -1206)
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Peter II of Courtenay, Emperor of Constantinople (1155-1217)  |
| Alix de Courtenay (1160-1218) |
| Robert I de Courtenay (1168-1239) |
| Gasce de Poissy ( -1189) |
| Constance de Courtenay (1174-1232)
|
| Mahaut de Châteaufort ( -1267) |