Hildouin III de Montdidier Count of Roucy

Hildouin III de Montdidier was born in 1000 in of Montdidier, Somme, France.  Hildouin III de Montdidier's father was Hildouin II de Montdidier Count of Roucy and his mother was daughter de Dammartin.  His paternal grandfather was Helpuin Count of Arcis-sur-Aube and his paternal grandmother is Hersinde de Rameru. He had a brother named Manasses de Ramerupt.  He was the older of the two children. He had a half-brother named Manasses de Ramerupt Ct.  He died at the age of 62 in 1062.

He had a biological son named Hildouin IV de Montdidier.