Hilduin I, Count of Montdidier

Hilduin I (died before 956), Count of Montdidier. It is unknown who the parents of Hilduin were. Hilduin was the founder of the House of Montdidier, which produced the Counts of Montdidier, Dammartin and Roucy.

There is considerable confusion as to the immediate family of Hilduin among historians and genealogists because of the lack of documented evidence, the preponderance of the names of Hilduin and Manasses in the family and the existence of other contemporary Hilduins (particularly, the Count of Montreuil).

The only creditable reference to Hilduin I was when Philip I, King of France, donated the village of Bagneux to the Abbey of Saint-Germain-des-Prés in exchange for Combs la Ville by charter dated 1061, which recounts that Hugh the Great had granted Combs to Hilduino…comiti de Monte qui vocatur Desiderius, who died before his benefactor (before 956), and that Henry I, King of France, had regranted Combs to Manasses nepos supradicti Hilduini comitis [Manasses, grandson of Hilduin] just as suus avunculus Hilduinus [his uncle Hilduin] had held it, noting that Odo comes filius prefati Manassetis [Odo, son of Manasses] now claimed the property.

Historians disagree as to the exact disposition of the descendants, but all agree that they descended from Hersende, Dame of Ramerupt, who was married to Hilduin I, or his son of the same name, or his brother, or, in some interpretations, his daughter. We cannot resolve these competing claims and will assume that Hilduin was married to Hersende (Heldwide). In 948, the first church in Montdidier, Somme, was built near the castle of Charlemagne by Hersende.

The count and his wife had two children:

The next known Count of Montdidier was Hilduin III, grandson of Hilduin I. The apparent gap in the countship is unexplained.

A common mistake is to assume the Hugh I, Count of Ponthieu, husband of Gisele, daughter of Hugh Capet, was the son of Hilduin I, when, in fact, his father was Hilduin (Herluin), Count of Montreuil, as discussed by Flodoard.


Tardif, J., Monuments historiques, Paris, 1866

Fanning, Steven and Bachrach, Bernard S. (translators), The Annals of Flodoard of Reims, 919-966. Readings in Medieval Civilizations and Cultures 9. Broadview Press, 2004

Morton, Catherine, and Muntz, Hope (editors), The Carmen de Hastingae Proelio of Bishop Guy of Amiens, Oxford at the Clarendon Press, 1972

Medieval Lands Project, Seigneurs de Ramerupt, Comtes de Montdidier, Comtes d’Arcis-sur-Aube

Medieval Lands Project, Comtes de Montreuil

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