 It was convened by the two augusti at the request of Pope Julius I.The first ecumenical council (Nicaea I) canon 5 decreed that bishops should convene in biannual synods within every province to act as a court of second instance and review cases with excommunication sentences pronounced by individual bishops.But, there was no appeal to a court of final instance "if an unjust sentence was imposed" by a provincial synod acting as a court of second instance.