Simon de Montfort, (born 1165?—died June 25, 1218, Toulouse, France), French leader of the Albigensian Crusade declared by Pope Innocent III against the Cathari, an unorthodox religious group in southern France. In 1190 Simon married Alice de Montmorency (died 1221).
Family Montfort was a younger son of Simon de Montfort, 5th Earl of Leicester, a French nobleman  and crusader, and Alix de Montmorency.  His paternal grandmother was Amicia de Beaumont, the senior co-heiress to the Earldom of Leicester and a large estate owned by her brother Robert de Beaumont, 4th Earl of Leicester, in England.
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Simon de Montfort, 5th Earl of Leicester ( c. 1175 – 25 June 1218), known as Simon IV (or V [a]) de Montfort and as Simon de Montfort the Elder, was a French nobleman and knight of the early 13th century. He is widely regarded as one of the great military commanders of the Middle Ages.
Siege of Zara Coordinates: 44°06′51″N 15°13′40″E The siege of Zara or siege of Zadar ( Croatian: Opsada Zadra; Hungarian: Zára ostroma; 10–24 November 1202) was the first major action of the Fourth Crusade and the first attack against a Catholic city by Catholic crusaders.
- 10 November – 24 November 1202
- Crusader-Venetian victory
Simon VI [a] de Montfort (April 1240 – 1271), known as Simon de Montfort the Younger, was the second son of Simon de Montfort, 6th Earl of Leicester and Eleanor of England . His father and his elder brother Henry were killed at the Battle of Evesham in August 1265. The younger Simon had been slow to bring his forces from London, and had seen ...
Jan 10, 2023 · The Historia Salonitanorum of Thomas Archdeacon of Split names "Symon comes de Monteforti" as one of the leaders of the army which landed at Zadar in Oct 1203 .