Simon I de Montfort
|Seigneur of Montfort|
|Predecessor||Amaury I de Montfort|
|Successor||Amaury II de Montfort|
Kingdom of France
|Died||25 September 1087(aged 61–62)|
|Buried||Épernon, Kingdom of France|
|Noble family||House of Montfort|
|Spouse(s)||Isabel de Broyes|
|Father||Amaury I de Montfort|
Simon I of Montfort or Simon de Montfort (c. 1025 – 25 September 1087) was a French nobleman. He was born in Montfort l'Amaury, in the Duchy of Normandy, and became its lord. He was the son of Amaury I de Montfort and Bertrade. At his death he was buried about 20 miles (32 km) away in Épernon, because it was the site of the fortress he was instrumental in constructing.
- 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.
- 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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- Blacker, Jean (1998). "Women, Power, and Violence in Orderic Vitalis's "Historia Ecclesiastica"". In Roberts, Anna (ed.). Violence Against Women in Medieval Texts. University Press of Florida.
- Châtelain, André (1983). Châteaux forts et féodalité en Ile de France, du XIème au XIIIème siècle (in French). Nonette.
- Green, Judith A. (2000). "Robert Curthose Reassessed". In Harper-Bill, Christopher (ed.). Anglo-Norman Studies: Proceedings of the Battle Conference. Vol. 22. The Boydell Press.
- Lippiatt, Gregory Edward Martin (2017). Simon V of Montfort and Baronial Government, 1195-1218. Oxford University Press.
- Power, Daniel (2004). The Norman Frontier in the Twelfth and Early Thirteenth Centuries. Cambridge University Press.