De Montfort refers to Simon de Montfort, a prominent figure in English history during the 13th century. He was a nobleman and military leader who played a crucial role in the Barons' War against King Henry III. De Montfort is best known for his efforts to establish a more representative form of government, which included the calling of the first elected parliament in 1265. De Montfort's legacy is significant in the development of parliamentary democracy in England. His actions laid the groundwork for the evolution of the English Parliament, influencing future governance and the relationship between the monarchy and its subjects. His life and contributions are often studied in the context of medieval political history.