XI stated in 1928, that the only means by which the world Christian community was to return to faith, was to return to Roman Catholic worship. In this regard, the Papacy rejected, to a great extent, the idea of the participation of the Catholic Church within the World Council of Churches. Pius XI stated that the ‘One true Church’ was that of the Roman Catholic denomination, and therefore there was the implication that the Catholic Church was not permitted at this stage to engage with other denominations, which the Papacy considered to be irrelevant. A similar policy was followed by his successor, Pope Pius XII; the Catholic Church, therefore, did not attend the 1948 meeting of the WCC, in addition to the idea that all members of the Church were barred from attending WCC conferences. Pope John XXIII took a different stance however, and in 1958 he was elected as the head of the Catholic Church. Ecumenism was a new element of Catholic ideology which had been permitted, which was signified to a great extent, when John XXIII met with the then Archbishop of Canterbury, Geoffrey Fisher. This was the first meeting between an Archbishop of Canterbury, and the Pope in the Vatican for 600 years. John XXIII later developed the office of the Secretariat for Promoting Christian Unity; which symbolised a dramatic shift in support for the ecumenical movement, from the Catholic Church, led from the Vatican. 1961 saw Catholic members attend the Delhi conference of the WCC, which marked a significant shift in attitude toward the WCC from the Papacy. There was the idea in addition to this, that the Pope invited non-Catholics to attend the Vatican II Council. This new approach to inter-denominational relations was marked within the Unitatis Redintegratio decree. This document marked several key reforms within the Catholic approach: I. ‘Separated brethren’ was the new term for non-Catholics, as opposed to the previously used ‘heretics’ II. Both Catholic and non-Catholic elements are held responsible for the schism between Catholicism and the Protestant movement III. Non-Catholics are recognised to the contributions that they make to Christian belief overall Further reforms have been enacted with regard to the nature of the Catholic Church on the world stage, for instance the 1965 union with the Patriarch of Constantinople, whereby the 1054 schism was undermined. In addition to this, Michael Ramsay, the then Archbishop of Canterbury, received an episcopal