What was the role of Simon de monfort in the Parliament?

Simon de Montfort played a pivotal role in the development of the English Parliament during the 13th century. He is best known for leading the Second Barons' War against King Henry III and, following his victory in 1265, he summoned a parliament that included not only nobles but also commoners, representing a broader segment of society. This move is often regarded as a significant step towards the establishment of a more democratic parliamentary system in England, laying the groundwork for future parliamentary reforms. De Montfort's actions emphasized the importance of representation and accountability in governance.