 Cantilupe was present at the Battle of Lewes and blessed the Montfortians before they joined battle with the army of the king; he entertained de Montfort on the night before the final rout and defeat of the Battle of Evesham.During Montfort's rule Cantilupe appeared only as a mediating influence; in the triumvirate of electors who controlled the administration, the clergy were represented by the Bishop of Chichester.Cantilupe died on 12 February 1266.