 In one letter, Celestine III reveals that the number of Canons had once been forty-two.In the 1180s, Bishop Oberto and the Cathedral Chapter had fallen to disputing, and to solve his difficulties, the Bishop had installed ten new Canons in one single event, bringing loud protests from the Chapter which reached Rome.The Pope ordered Milo, the Archbishop of Milan, and the Papal Legate Peter of Santa Cecilia to intervene and cancel the appointments as illegal ("irritum") if they contravened papal bulls.