Simon I of Montfort or Simon de Montfort ( – 25 September 1087) was a French nobleman. He was born in Montfort l'Amaury, near Paris, and became its lord. He was the son of Amaury I de Montfort and Bertrade. At his death he was buried about away in Épernon, because it was the site of the fortress he was instrumental in constructing.
Progeny Simon I first married Isabel de Broyes (b. 1034 in Broyes, Marne), daughter of Hugh Bardoul. Their children were: Amaury II de Montfort (c. 1056 – 1089), lord of Montfort Isabel (Elizabeth) de Montfort (b. 1057), who married Raoul II de Tosny, a companion of William the Conqueror.
Simon I's second marriage was to Agnes d'Évreux (b. 1030), daughter of Richard, Count of Évreux. Their children were:
Bertrade de Montfort (c. 1059 – 1117), became queen of France. Richard de Montfort (c. 1066 – 1092), lord of Montfort, slain in attack on abbey at Conches. Simon II de Montfort (c. 1068 – 1104), lord of Montfort Amaury III de Montfort (c. 1070 – 1137), lord of Montfort and Count of Évreux. Guillaume de Montfort (c. 1073–1101), bishop of Paris. Adeliza de Montfort (b. 1075)
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