Earl Simon ("the Crusader") de Montfort V of Leicester
Simon, known as "the Crusader", was born in 1182.  He died at the age of 36 on June 25th, 1218 in Belagerung, Toulouse, France.

 Alix de Montmorency
Alix was born in Montmorency, Seine-et-Oise, France.

 Earl Simon de Montfort VI of Leicester
Simon was born in 1208 in Montfort l' Amaury, Isle de France, France.  He died  due to died in Battle of Evesham at the age of 57 on August 4th, 1265 in Evesham, Worcestershire, England.