The title Earl of Leicester (pronounced /ˈlɛstər/ LESS-tər) has been created seven times, the first title in the 12th century in the Peerage of England. The current title is in the Peerage of the United Kingdom and was created in 1837.
The title was first created for Robert de Beaumont (also spelled de Bellomont), but he nearly always used his French title of Count of Meulan. Three generations of his descendants, all also named Robert, called themselves Earls of Leicester. The Beaumont male line ended with the death of the Fourth Earl. His property was split between his two sisters, with Simon IV de Montfort, the son of the eldest sister, acquiring Leicester and the rights to the earldom. (The husband of the younger daughter, Saer de Quincy, was created Earl of Winchester.) De Montfort however was never formally recognized as earl, due to the antipathy between France and England at that time. His second son, Simon V de Montfort, did succeed in taking possession of the earldom and its associated properties. He is the Simon de Montfort who became so prominent during the reign of Henry III. He was killed at the Battle of Evesham in 1265, and his lands and titles were forfeited.
In 1267 the title was created a second time and granted to the king's youngest son Edmund Crouchback. In 1276 he also became Earl of Lancaster, and the titles became united. Crouchback's son Thomas lost the earldom when he was executed for treason in 1322, but a few years later it was restored to his younger brother Henry. Henry's son Henry of Grosmont left only two daughters, and his estate was divided between them, the eldest daughter Matilda receiving the earldom, which was held by her husband William V of Holland. (The two passages of the earldom via females illustrate the medieval practice by which such inheritance was allowed in the absence of male heirs.) Matilda, however, soon died, and the title passed to John of Gaunt, husband of her younger sister, Blanche, who was later created Duke of Lancaster. Both the dukedom and the earldom were inherited by John of Gaunt's son, Henry Bolingbroke, and both titles ceased to exist when Henry usurped the throne, as the titles "merged into the crown". (The peers are vassals to the Sovereign, and no one can be a vassal to himself.) The properties associated with the earldom became part of what was later called the Duchy of Lancaster.