On 21st July, 1900, Pope Leo XIII issued his Encyclical Letter Omnibus Compertum on Unity among the Greek Catholics:
"To prevent future contestations of rights, it would be most effective to convene a plenary Council. That is why, as We have already recommended to you on other occasions, We prescribe it for you now by this letter. The Council should be convened as soon as possible. The following matters should be discussed: the rights of the patriarch and of the bishops; the correct administration of the faithful; the discipline of the clergy, monastic orders, and other religious institutions; the needs of missions; the beauty of divine worship; the sacred liturgy; and other related matters which should be considered with prudent care to ensure the greater glory of God and to increase the honor of the Greek Melchite church. As the other Eastern churches have drawn great profit from the meeting of their national council in arranging their affairs and in restoring ecclesiastical discipline, so We can rightly promise magnificent results for your church from the com position and promulgation of written laws."