Simon I of Montfort

Simon I of Montfort (died 1087) was the third lord of Montfort-l'Amaury, succeeding his father Amaury I. He continued the family's building programme, founding the church of Saint-Pierre. By his first wife Isabelle he had Amaury II and Guillaume, later bishop of Paris.

After Isabelle died, Simon sought Agnès d'Évreux, but her father refused; her half-brother Raoul de Tosny carried her off to Montfort to become his second wife. Agnès bore Richard, Simon II, Amaury III and Bertrade, who married Fulk IV of Anjou and then King Philip I of France.