Simon de Montfort, 5th Earl of Leicester
（重定向自Montfort, Simon de）
![Seal of Simon IV de Montfort](/Images/godic/202501/28/Simon4demontfort5952.gif")
![Plaque commemorating the death of Simon de Montfort](/Images/godic/202501/28/Toulouse_-_Plaque_de_Simon_de_Monfort5952.jpg")
Simon IV of Montfort, lord of Montfort-l'Amaury, 5th earl of Leicester (c.1175 – 25 June 1218), also known as Simon de Montfort the elder, was a French warlord who took part in the Fourth Crusade (1202–1204) and was a prominent leader of the Albigensian Crusade. He died at the siege of Toulouse in 1218.