Hildouin IV Hildouin IV de Montdidier Count of , Count of Montdidier/de Roucy 
Hildouin IV was born about 1021 in Montdidier, Somme, France. He died in 1063.
‌Hildouin IV and Adelaide were married in a religious ceremony in 1031. They had a son and four daughters, named Andre, Adelheid, Felicitas (Felicie), Marguerite and Beatrice.
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Children
Felicitas (Felicie) de Roucy , Queen of Aragon
Felicitas (Felicie) was born in 1045 in Montdidier, Picardy, France. She died at the age of 78 on April 24th, 1123.
Beatrice de Montdidier
Beatrice was born in 1047 in Montdidier, Picardy, France. She died at the age of 82 on September 2nd, 1129.
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