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Wilhelm von Dampierre (French: Guillaume de Dampierre; † 3 September 1231) was a lord of Dampierre-sur-l'Aube and Saint-Dizier and founder of the Flemish branch of the House of Dampierre. He was a younger son of Sire Guido II of Dampierre and Mathilde of Bourbon.

In 1221, Wilhelm obtained from his elder brother Archambault the establishment in the paternal heir, Dampierre and Saint-Dizier, and the transfer of the office of a Connetablé of Champagne. His plan to marry Alice of Cyprus and thus secure an entitlement to the county of Champagne failed in 1223 due to the Pope’s objection, who refused a necessary dispensation due to close kinship. But in the same year Wilhelm married the eventual heiress of Flanders and Henegau, Margarete, although she was also closely related to him. In this case, too, the Pope initially refused a dispensation, with which this relationship, like Margarete’s first marriage to Burkhard von Avesnes, was not legitimate under canon law. Only after the birth of their first four children did the couple receive the dispensation in 1230, legitimizing their marriage as well as their children.

Wilhelm died before his wife could take over the counties of Flanders and Henegau in 1244. Her children were considered legitimate heirs, but Margarete’s sons from her first marriage also made claims to the inheritance, triggering the Flemish War of Succession. Wilhelm was buried in the Cistercian Abbey of Orchies (Arrondissement of Douai), but was transferred to the Abbey of Flines in 1257.

Wilhelm's children from his marriage to Margarete von Flanders were:

Johanna von Dampierre (* 1224; † 1246)
with Count Hugo III. by Rethel
with Count Theobald II. from Bar
Wilhelm III of Dampierre (* 1224; † 1251), Lord of Dampierre and Saint-Dizier, as Wilhelm II. Count of Flanders and Henegau
Guido von Dampierre (* 1226; † 1304), Count of Flanders and Margrave of Namur
John I of Dampierre (* 1228, † 1257), Lord of Dampierre and Saint-Dizier
Marie von Dampierre (* 1230; † 1302), abbess of Flines

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Mr (France)
Constables
Family member of the medieval noble family Dampierre
French
Born in the 12th or 13. Century
Died in 1231
Man