In January 1999, Catholicos Karekin I wrote an article revisiting the Council of Hromkla and its contribution to the history and theology of the Armenian Apostolic Church.
Catholicos Gregory III Pahlavuni sent his brother and future successor, Nerses IV the Gracious, to negotiate with the Byzantines and explore the possibility of union.
[4] Emperor Manuel I Comnenus, who had a religious education, became quickly interested in the matter and decided to ask Nerses to send the statement of faith of the Armenian Apostolic Church to Constantinople.
[3][7] The rest of the letter addressed practical organizational matters related to fasting, liturgy,[3][8][9] and the date of Christmas, which the Armenian Apostolic Church celebrated separately.
[9] They brought along a series of demands from the emperor, covering not only doctrinal points but also liturgical and organizational issues, which troubled Nerses due to their severity.
[4][13] In 1174, Gregory IV managed to persuade the Byzantine emperor to set aside a significant portion of the demands and focus on doctrinal questions, mainly the issue of Monophysitism or Dyophysitism.
[3] In response to their accusations of Nestorianism, Gregory sent them a peaceful letter, urging them to reconsider and still come to the council, stating:[18]The Greeks have invited us once and twice, should we not meet them courageously and either agree with them or make them agree with us ?At the council, Nerses of Lampron, the archbishop of Tarsus, delivered a notable speech in which he criticized the hostilities between the Eastern Orthodox Church and the Armenian Apostolic Church.
[19][20] The council accepted the union with the Eastern Orthodox Church[3][9][21] and proposed a profession of faith embracing the dyophysite belief while adopting the Chalcedonian terminology.