 He led the Londoners at the Battle of Lewes in 1264, where he was taken prisoner, and fought at the Battle of Evesham in 1265, where de Montfort was killed.He resisted King Henry III at Kenilworth and after the Dictum of Kenilworth he commanded the last remnants of the baronial party when they made their last stand in the Isle of Ely, but submitted to the king in July 1267.In 1264 he was created a supposed baron by de Montfort, which title had no legal validity following the suppression of the revolt.