The Second Barons' War Begins

So the first phase of the Second Barons' War happened very quickly. The rebellious barons invaded London and captured King Henry III and Queen Eleanor of Provence. Simon de Montfort, who was married to Henry's sister, assumed control of the government, making rulings in Henry's name.Much of the country was still loyal to the king, however, and there were nobles with soldiers who opposed Simon. Henry's son Edward (later King Edward I) had originally dabbled with rebelling against his father (a common occurrence in English politics), but now decided to become leader of the royalist party. He brought his own forces to capture Windsor away from the rebels.Widespread fighting was inevitable, and so they turned to King Louis IX of France. Why? One of the provisions of Magna Carta was that France's king would be brought in to mediate between England's king and his barons.Henry was allowed to go to France in December 1263 to present his side to Louis. Simon, having sustained a broken leg…