Hildouin de Ramerupt IV, comte de Montdidier et de Roucy 1
- Born: 22 Jun 1010, Montdidier, Somme, Picardy, France
- Marriage (1): Adelaide De Roucy Comtesse de Montdidier
- Died: 15 Nov 1063, Ramerupt, Aube, Champagne-Ardennnes, France at age 53
Hildouin married Adelaide De Roucy Comtesse de Montdidier, daughter of Ebles De Roucy I, Count of Roucy and Béatrix de Hainaut. (Adelaide De Roucy Comtesse de Montdidier was born about 1000 in Roucy, Aisne, Hauts-de-France, France and died on 18 Sep 1066 in France.)
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