Simon de Montfort, 6th Earl of Leicester (c. 1208 – 4 August 1265), sometimes referred to as Simon V de Montfort to distinguish him from his namesake relatives, was a nobleman of French origin and a member of the English peerage, who led the baronial opposition to the rule of King Henry III of England, culminating in the Second Barons' War. Following his initial victories over royal forces, he became de facto ruler of the country, and played a major role in the constitutional development of England.

During his rule, Montfort called two famous parliaments. The first stripped the King of unlimited authority, while the second included ordinary citizens from the towns. For this reason, Montfort is regarded today as one of the progenitors of modern parliamentary democracy. As Earl of Leicester he expelled Jews from that city; as he became ruler of England he also cancelled debts owed to Jews through violent seizures of records. Events in London and Worcester, for instance, led to massacres. After a rule of just over a year, Montfort was killed by forces loyal to the King in the Battle of Evesham.

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.

With the irrevocable loss of Normandy, King John refused to allow the elder Simon to succeed to the earldom of Leicester and instead placed the estates and title into the hands of Montfort senior's cousin Ranulf, the Earl of Chester. The elder Simon had also acquired vast domains during the Albigensian Crusade, but was killed during the Siege of Toulouse in 1218 and his eldest son Amaury was not able to retain them. When Amaury was rebuffed in his attempt to get the earldom back, he agreed to allow his younger brother Simon to claim it in return for all family possessions in France.

Simon arrived in England in 1229, with some education but no knowledge of English, and received a sympathetic hearing from King Henry III, who was well-disposed towards foreigners speaking French, then the language of the English court. Henry was in no position to confront the powerful Earl of Chester, so Simon approached the older, childless man himself and convinced him to cede him the earldom. It would take another nine years before Henry formally invested him with the title Earl of Leicester.

As a younger son, Simon de Montfort attracted little public attention during his youth, and the date of his birth remains unknown. He is first mentioned when his mother made a grant to him in 1217. As a boy, Montfort accompanied his parents during his father's campaigns against the Cathars. He was with his mother at the Siege of Toulouse in 1218, where his father died after being struck on the head by a stone pitched by a mangonel. In addition to Amaury, Simon had another older brother, Guy, who was killed at the siege of Castelnaudary in 1220. As a young man, Montfort probably took part in the Albigensian Crusades of the early 1220s. He and Amaury both took part in the Barons' Crusade.

In 1229 the two surviving brothers (Amaury and Simon) came to an arrangement with King Henry whereby Simon gave up his rights in France and Amaury gave up his rights in England. Thus freed from any allegiance to the King of France, Montfort successfully petitioned for the English inheritance, which he received the next year, although he did not take full possession for several years, and did not win formal recognition as Earl of Leicester until February 1239.

Montfort became a favourite of King Henry III and even issued a charter as "Earl of Leicester" in 1236, despite having not yet been granted the title.

In that same year Simon tried to persuade Joan, Countess of Flanders to marry him. The idea of an alliance between the rich County of Flanders and a close a

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