His escape and subsequent victory at the Battle of Evesham and the Siege of Kenilworth put an end to this conflict.
One cause of this conflict stemmed from a papal grant which sought to bring forward an unexpected claim and a foreign army to oppose Emperor Frederick II's illegitimate son Manfred, who nonetheless had himself crowned King of Sicily. Another foreign cause of this conflict was seemingly settled before this conflict began with a Treaty of Paris that surrendered a claim  to the Duchy of Normandy to Louis IX. That treaty resulted directly from the Provisions of (*) Oxford, which sought to limit claims on the exchequer. A papal bull of 1261 permitted the provisions to be disavowed, leading to the Battle of Lewes, at which the future Edward I was captured. His escape and subsequent victory at the Battle of Evesham and the Siege of Kenilworth put an end to this conflict. For 10 points, name this aristocratic challenge to royal authority in England, during which Henry III's rule was temporarily overthrown by Simon de Montfort and his noble supporters.
One cause of this conflict stemmed from a papal grant which sought to bring forward an unexpected claim and a foreign army to oppose Emperor Frederick II's illegitimate son Manfred, who nonetheless had himself crowned King of Sicily.
Second Barons' War (accept reasonable synonyms for "war," such as "rebellion")