Simon de Montfort was a Frenchman who married King Henry III’s sister. He owned land in England, and became the Earl of Leicester. Simon considered Henry unfit to rule, and led a group of barons who forced the Provisions of Oxford on the king. When Henry refused to rule according to the Provisions, Simon ultimately led a baronial rebellion. He managed to capture the king at the Battle of Lewes. He then governed England as a military dictator for a short time.
