Simon I De Montfort
Simon I was born about 1025 in Montfort, Amaury, Ile De France, France.  He died on September 25th, 1087 in St. Thomas, France.

 Isabel Bardoul
Isabel was born about 1026.  She died before 1055.

 Isabel De Montfort
Isabel was born about 1050.  She died after 1120.