Nielsen Hayden genealogy
Family: Jean II de Roucy / Marie de Dammartin (F22011)
m. Bef 15 Dec 1241
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Male
Jean II de Roucy
Birth Death 1251 Flanders 
Burial Marriage Bef 15 Dec 1241 [1, 2] Father Robert I de Pierrepont | F27154 Group Sheet Mother Eustachie de Roucy | F27154 Group Sheet
Female
Marie de Dammartin
Birth Death Burial Father Simon II de Dammartin | F3037 Group Sheet Mother Marie of Ponthieu | F3037 Group Sheet
Male
+ Jean III de Roucy
Birth Death 1282 Burial Spouse Isabelle de Mercoeur | F27153 Marriage Bef 1260
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Sources - [S6193] John P. DuLong and Jean Bunot, "Catherine de Baillon's de Roye Ancestry: Another Royal Gateway." Michigan's Habitant Heritage 30:5, Jan 2009.
- [S49] Genealogics by Leo Van de Pas, continued by Ian Fettes and Leslie Mahler.
- [S6193] John P. DuLong and Jean Bunot, "Catherine de Baillon's de Roye Ancestry: Another Royal Gateway." Michigan's Habitant Heritage 30:5, Jan 2009.