| Constance (de Montcada), suo jure Viscountess of Marsan | |
| D: | circa 1299 |
| Henry (Plantagenet) |
| Henry (Plantagenet) | |
| B: | 2 Nov. 1235 |
| M: | circa 1269 |
| D: | 13 March 1271 |
| Viterbo, Italy | |
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