 In <unk> , King Henry III of England faced a revolt among the English barons . Anger had grown about the way the King 's officials were raising funds , the influence of his <unk> relatives at court and his unpopular Sicilian policy ; even the English Church had grievances over its treatment by the King . Within Henry 's court there was a strong feeling that the King would be unable to lead the country through these problems . On 30 April , Hugh <unk> marched into Westminster in the middle of the King 's parliament , backed by his co @-@ conspirators , including Simon de Montfort , the Earl of Leicester , and carried out a coup d 'état . Henry , fearful that he was about to be arrested and imprisoned , agreed to abandon his policy of personal rule and instead govern through a council of 24 barons and churchmen , half chosen by the King and half by the barons . 
