The Eastern Orthodox Church, officially the Orthodox Catholic Church, and also called the Greek Orthodox Church or simply the Orthodox Church, is the second-largest Christian church, with approximately 230 million baptised members. It operates as a communion of autocephalous churches, each governed by its bishops via local synods. The church has no central doctrinal or governmental authority analogous to the head of the Catholic Church. Nevertheless, the Ecumenical Patriarch of Constantinople is recognised by them as primus inter pares, a title formerly given to the patriarch of Rome. As one of the oldest surviving religious institutions in the world, the Eastern Orthodox Church has played an especially prominent role in the history and culture of Eastern and Southeastern Europe.
Gregory of Nazianzus, also known as Gregory the Theologian or Gregory Nazianzen, was a 4th-century archbishop of Constantinople and theologian. He is widely considered the most accomplished rhetorical stylist of the patristic age. As a classically trained orator and philosopher, he infused Hellenism into the early church, establishing the paradigm of Byzantine theologians and church officials.
Bartholomew is the 270th Archbishop of Constantinople and Ecumenical Patriarch, since 2 November 1991. In accordance with his title, he is regarded as the primus inter pares in the Eastern Orthodox Church, and as a spiritual leader of the Eastern Orthodox Christians worldwide.
Ecumenism – also called interdenominationalism, or ecumenicalism – is the concept and principle that Christians who belong to different Christian denominations should work together to develop closer relationships among their churches and promote Christian unity. The adjective ecumenical is thus applied to any non-denominational initiative that encourages greater cooperation and union among Christian denominations and churches.
Christian−Jewish reconciliation refers to the efforts that are being made to improve understanding and acceptance between Christians and Jews. There has been significant progress in reconciliation in recent years, in particular by the Catholic Church, but also by other Christian groups.
The National Council of the Churches of Christ in the USA, usually identified as the National Council of Churches (NCC), is the largest ecumenical body in the United States. NCC is an ecumenical partnership of 38 Christian faith groups in the United States. Its member communions include mainline Protestant, Eastern Orthodox, Oriental Orthodox, African-American, evangelical, and historic peace churches. Together, it encompasses more than 100,000 local congregations and 40 million adherents. It began as the Federal Council of Churches in 1908, and expanded through merger with several other ecumenical organizations to become the National Council of Churches in 1950. Its Interim President and General Secretary is Bishop Vashti Murphy McKenzie.
Interfaith dialogue refers to cooperative, constructive, and positive interaction between people of different religious traditions and/or spiritual or humanistic beliefs, at both the individual and institutional levels.
The East–West Schism, also known as the Great Schism or the Schism of 1054, is the break of communion between the Catholic and Eastern Orthodox churches since 1054. A series of ecclesiastical differences and theological disputes between the Greek East and Latin West preceded the formal split that occurred in 1054. Prominent among these were the procession of the Holy Spirit (Filioque), whether leavened or unleavened bread should be used in the Eucharist, iconoclasm, the coronation of Charlemagne as Emperor of the Romans in 800, the Pope's claim to universal jurisdiction, and the place of the See of Constantinople in relation to the pentarchy.
The Washington Theological Consortium is an ecumenical organization of Christian theological schools and interfaith partners located in Washington, DC, Virginia, Maryland, and Pennsylvania. Members cooperate to deepen ecumenical unity in theological education and to broaden interfaith dialogue and understanding and to prepare both clergy and laity with skills they need to minister in a diverse church and society. The Consortium is one of the most diverse of its kind in the nation, as it includes Roman and Byzantine Catholic traditions, mainline Protestants, Evangelicals, and Historic Black Divinity schools; with partners in spiritual formation, Jewish, and Islamic education.
Michael Louis Fitzgerald is a British cardinal of the Roman Catholic Church and an expert on Christian–Muslim relations. He has had the rank of archbishop since 2002. At his retirement in 2012, he was the apostolic nuncio to Egypt and delegate to the Arab League. He headed the Pontifical Council for Interreligious Dialogue from 2002 to 2006. Pope Francis raised him to the rank of cardinal on 5 October 2019.
Marc H. Tanenbaum (1925–1992) was a human rights and social justice activist and rabbi. He was known for building bridges with other faith communities to advance mutual understanding and co-operation and to eliminate entrenched stereotypes, particularly ones rooted in religious teachings.
Stanley Jedidiah Samartha was an Indian theologian and a participant in inter-religious dialogue.
Vilakuvelil Cherian Samuel (1912–1998), called Samuel Achen was an Indian Christian philosopher, scholar, university professor, theologian, historian, polyglot and ecumenical leader. He was a priest of the Indian Orthodox Church. He was the author of many doctrinal books and papers including The Council of Chalcedon Re-Examined: Historical Theological Survey.
Brian Edward Daley, S.J. is an American Catholic priest, Jesuit, and theologian. He is currently the Catherine F. Huisking Professor of Theology (Emeritus) at the University of Notre Dame and was the recipient of a Ratzinger Prize for Theology in 2012.
The Committee on Ecumenical and Interreligious Affairs is the principal ecumenical and interfaith organization of the United States Conference of Catholic Bishops.
The Canadian Centre For Ecumenism (CCE) is a non-profit organization whose main focus is interfaith dialogues and is established in Montreal, Québec, Canada. The centre is supported by the Canadian Conference of Catholic Bishops. It promotes conversations, interfaith dialogues and ecumenical dialogues.
Petros B. Vassiliadis is a Greek biblical scholar and Professor Emeritus of the Department of Theology of the Aristotle University of Thessaloniki (AUTh), honorary president of the Center of Ecumenical, Missiological and Environmental Studies “Metropolitan Panteleimon Papageorgiou” (CEMES) and the World Conference of Associations and Theological Institutions and Educators (WOCATI).
Nomikos Michael Vaporis (1926–1997) was an historian of the Byzantine Empire and Modern Greek Hellenism at Hellenic College/Holy Cross Greek Orthodox School of Theology in Brookline, Massachusetts, United States. He also served as Dean of Hellenic College (1975–1985), Acting Dean of Holy Cross (1977), Acting Dean of Hellenic College (1993) and Interim Dean, Holy Cross (1993–1995). His other positions included: Director of Holy Cross Orthodox Press (1976–1995), Editor of the Greek Orthodox Theological Review (1972–1995), and Founder and Co-editor of the Journal of Modern Hellenism (1984–1997). During his career he also worked for interfaith dialogue, participating in peace missions, and organizing conferences and publishing academic works on the subject.
Catholic–Eastern Orthodox relations have warmed over the last century, as both churches embrace a dialogue of charity. The Second Vatican Council (1962-1965) ushered in a new era of relations for the Roman Church towards the Orthodox Church, fondly describing the Orthodox as “separated brethren” with valid sacraments and an apostolic priesthood. The Orthodox Church, on the other hand, encouraged local churches to prepare for future dialogue in the Third Pan-Orthodox Conference in Rhodes (1964), and has since engaged in several ecumenical efforts with the Vatican. Significantly, in 1965 Pope Paul VI and Ecumenical Patriarch Athenagoras I of Constantinople jointly lifted the mutual excommunications of 1054.
Patricia (Trish) Madigan is an Australian religious sister, a member and leader of the Dominican Sisters of Eastern Australia and the Solomon Islands and Executive Director of the Dominican Centre for Interfaith Ministry Education and Research (CIMER). Madigan is known nationally and internationally as "a leader in ecumenical and interfaith relations in the Catholic Church in Australia".
