Nielsen Hayden genealogy
Constance ferch Owain

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- 1 Constance ferch Owain [1]
David de Malpas
- 2 Idonea de Malpas [1.1]
d. Bef 1295
Urian de St. Pierre b. 1220 d. Between 1290 and 1300
- 3 Katherine de St. Pierre [1.1.1]
d. Aft 1296
Randle le Roter d. Bef 1296
- 4 Peter Thornton [1.1.1.1]
b. Abt 1292 d. Between 1351 and 1358 [ =>]
- 4 Peter Thornton [1.1.1.1]
- 3 John de St. Pierre [1.1.2]
b. 1246 d. 1290
Katherine Dutton d. Aft 1292
- 4 Ellen de St. Pierre [1.1.2.1]
[ =>]
- 4 Urian de St. Pierre [1.1.2.2]
b. 1280 d. 1311 [ =>]
- 4 Ellen de St. Pierre [1.1.2.1]
- 3 Katherine de St. Pierre [1.1.1]
- 2 Idonea de Malpas [1.1]