Simon de Montfort, 5th Earl of Leicester (c. 1175 – 25 June 1218), known as Simon IV (or V) 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.
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.