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Guillaume I Hainaut de Montfort, Lord of Montfort, was born circa 955 to Rodolphe de Hainaut (c922-aft966) and died circa 1011 of unspecified causes. He married Fille de Beauvais . Charlemagne (747-814)/s.

Sources agree that Guillaume de Montfort was a grandson of Regnier II de Hainaut, but not a son of Regnier III. It is not known whether Guillaume was a son of Rodolphe (as shown here), of Liethard, or of a fourth son called Amaury.


Offspring of Guillaume I de Montfort and Fille de Beauvais
Name Birth Death Joined with
Amaury I de Montfort (c990-1053) 990 1053 Bertrade de Gometz

Footnotes (including sources)

‡ General
Ω Birth
  • year of birth from brother