At the Council, Pope Gregory promulgated a new crusade in liaison with the Mongols, putting in place a vast program in his "Constitutions for the zeal of the faith", with four main elements: imposing a new tax for three years, forbidding trade with the Sarazins (Muslims), arranging the supply of ships by the Italian maritime republics, and the alliance of the West with both Byzantium and the Mongol Ilkhan Abaqa. Abaqa then sent another embassy, led by the Georgian Vassali brothers, to further notify Western leaders of military preparations. Gregory answered that his legates would accompany the crusade, and that they would be in charge of coordinating military operations with the Ilkhan.