Sir Henry de Montfort (November 1238 – 1265) was the son of Simon de Montfort, 6th Earl of Leicester, and with his father played an important role in the struggle of the barons against King Henry III. Henry's mother was Princess Eleanor of England (daughter of King John), whose marriage to Simon further increased the foreign influence begun by the king, which was to result in great hostility by those very barons who later revolted against the king.