Second Vatican Council
The Second Ecumenical Council of the Vatican, commonly known as the or , addressed relations between the Catholic Church and the modern world. The council, through the Holy See, was formally opened under the pontificate of Pope John XXIII on 11 October 1962 and was closed under Pope Paul VI on the Solemnity of the Immaculate Conception on 8 December 1965.
Gregorio Pietro Agagianian
Agagianian sat on the Board of Presidency of the Second Vatican Council (Vatican II), which took place from 1962 to 1965. He was appointed by Pope Paul VI as one of the four moderators who directed the course of the debates, along with Leo Joseph Suenens, Julius Döpfner, and Giacomo Lercaro. Agagianian was the only one of these four from the Curia, and represented the Eastern Catholic Churches. He had a special role in the preparation of the missionary decree "Ad gentes" and "Gaudium et spes", the Constitution on the Church in the Modern World.