 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.On 25 January 1074, Pope Gregory VII summoned all the bishops of the ecclesiastical province of Milan, including the bishop of Tortona (whose name is unfortunately not mentioned), to a synod to be held in Rome on the first Sunday of Lent.A diocesan synod was an irregular but important meeting of the bishop of a diocese and his clergy.