“Eugenius, bishop, servant of the servants of God, for an everlasting record. Blessed be the God and Father of our lord Jesus Christ, the Father of mercies and God of all consolation, who daily promotes with many great favours, and accompanies with happy results far beyond our deserts, our aims and pious desires, whereby in fulfilment of our pastoral duties we long for and foster with many works, in so far as this allowed us from on high, the salvation of the Christian people.Indeed, after the union of the eastern church with the western church in the ecumenical council of Florence, and after the return of the Armenians, the Jacobites and the people of Mesopotamia, we despatched our venerable brother Andrew, archbishop of Kalocsa, to eastern lands and the island of Cyprus. He was to confirm in the faith which had been accepted the Greeks, Armenians and Jacobites living there, by his sermons and his expositions and explanations of the decrees issued for their union and return. He was also to try to bring back to the truth of the faith, using our warnings and exhortations, whoever else he might find there to be strangers to the truth of faith in other sects, whether they are followers of Nestorius or of Macarius.He pursued this task with vigour, thanks to the wisdom and other virtues with which the Lord, the giver of graces, has enriched him. He finally eliminated from their hearts, after many discussions, first all the impurity of Nestorius, who asserted that Christ is only a man and that the blessed Virgin is the mother of Christ but not of God, then that of the most impious Macarius of Antioch who, although he confessed that Christ is true God and man, asserted that there is in him only the divine will and principle of action, thereby diminishing his humanity.With divine assistance he converted to the truth of the orthodox faith our venerable brothers Timothy, metropolitan of the Chaldeans, who have been called Nestorians in Cyprus until now because they used to follow Nestorius, and Elias, bishop of the Maronites, who with his nation in the same realm was infected with the teachings of Macarius, together with a whole multitude of peoples and clerics subject to him in the island of Cyprus. To these prelates and all their subjects there, he delivered the faith and doctrine that the holy church has always cherished and observed. The said prelates, moreover, accepted this faith and doctrine with much veneration in a great public assembly of different peoples living in that realm, which was held in the metropolitan church of St Sophia.” 

Pope Eugene IV, Council of Rome (fourth and final location of the Council of Basel-Ferrara-Florence-Rome), Session XIV, Bull of union with the Chaldeans and the Maronites of Cyprus