2 Now for the accomplishment of this conversion it is necessary for you, Venerable Brethren, who rule the Armenian dioceses, and who, We know, will never be wanting in zealous exhortation or persuasive teaching, to give all your efforts. Moreover, We are anxious that they, who do not acknowledge Us, should be called back through you, in Our name and by Our words; for it is no shame - nay, it is praiseworthy in the highest degree - that a father should himself call his wandering and long expected children home - should even go forth with open arms to receive and welcome them. Nor do We think it possible for your words and arguments to fall on barren soil, for the great mercy of God which He has shown to the nations, supported by the humble - mindedness and docility of the Armenian people give Us hope for a favourable result. The testimony of history is full of manifold examples of their readiness to embrace truth once recognized, and their eagerness to retrace their steps if they see that they have fallen away from the right path. Nay, even these very men who fulfil the duties of religion in schism from you, boast that the Armenians were taught the faith of Christ by Gregory, a man of eminent holiness, who earned the surname of "the Enlightener," and they honour him as their father and patron with displays of much reverence and devotion. It is moreover recorded amongst them that this man undertook a journey to the City of Rome, to lay his faith and his obedience at the feet of the Roman Pontiff, St. Sylvester, who, it is said, received him with much affection and conferred upon him several privileges. We know, moreover, that many of those who afterwards ruled the Armenian Churches followed in the footsteps of Gregory - from their letters, their pilgrimages to Rome, and especially from their Synodal Decrees. Particularly memorable are the Decrees of the Armenian Fathers in the Synod of Sizeboli, held in the year 1307, on the duty of obedience to this Apostolic See: "As the body must obey the head, so the Universal Church (which is the body of Christ) should obey him who has been appointed by Christ the Lord, head of the whole Church." and explained more clearly in the Council of Adano in the 16th year of the same century. You are well aware also - to speak of less important embassies - what took place in the Synod of Florence; for when the Legates of the Patriarch Constantine V arrived there, they said that they had come to the head, to the shepherd, to the corner-stone of the Church, entreating Eugene IV, Our predecessor in the Vicariate of the Lord Christ, as head to sympathise with the members, as shepherd to gather together the flock, as corner-stone to strengthen the Church;(2) and bringing forth the symbol of their faith they asked, "If aught is wanting, instruct us." Then the Constitution of the Council, Exultate Deo , was published by the pope, in which he taught them all that he considered to be necessary for the right knowledge of Catholic truth; and upon this, the Legates, in the name of their Patriarch, and of the whole Armenian race, declared that they received the Constitution in entire submission and readiness to obey, "promising in the same name, as true sons of obedience, loyally to obey the behests and commands of the Apostolic See." On this account Azarias, Patriarch of Cilicia, wrote most truly in letters addressed to Our predecessor, Gregory XIII, dated April 10th 1585; "Behold we have found the Decrees of our predecessors on the obedience of Catholics and our Patriarchs to the Roman Pontiff, and on the submission of St. Gregory 'the Enlightener' to Pope St. Sylvester." Hence it has ever been the custom of the Armenian race to receive with honour Legates sent on any mission from the Apostolic See, and to carry out the commands of that See with religious care.
Source: Paterna Caritas (Vatican.va)