An ecumenical council, also called general council, is a meeting of bishops and other church authorities to consider and rule on questions of Christian doctrine, administration, discipline, and other matters in which those entitled to vote are convoked from the whole world (oikoumene) and which secures the approbation of the whole Church.
Filioque, a Latin term meaning "and from the Son," was added to the original Niceno-Constantinopolitan Creed, and has been the subject of great controversy between Eastern and Western Christianity. The term refers to the Son, Jesus Christ, with the Father, as the one shared origin of the Holy Spirit. It is not in the original text of the Creed, attributed to the First Council of Constantinople (381), which says that the Holy Spirit proceeds "from the Father", without additions of any kind, such as "and the Son" or "alone".
The Fourth Council of Constantinople was held in 879–880. It confirmed the reinstatement of Photius I as patriarch of Constantinople.
Pope Adrian II was the bishop of Rome and ruler of the Papal States from 867 to his death. He continued the policy of his predecessor, Nicholas I. Despite seeking good relations with Louis II of Italy, he was placed under surveillance, and his wife and daughters were killed by Louis' supporters.
Photios I, also spelled Photius, was the ecumenical patriarch of Constantinople from 858 to 867 and from 877 to 886. He is recognized in the Eastern Orthodox Church as Saint Photios the Great.
Pope Nicholas I, called Nicholas the Great, was the bishop of Rome and ruler of the Papal States from 24 April 858 until his death. He is remembered as a consolidator of papal authority, exerting decisive influence on the historical development of the papacy and its position among the Christian nations of Western Europe. Nicholas I asserted that the pope should have suzerainty over all Christians, even royalty, in matters of faith and morals.
Pope John VIII was the bishop of Rome and ruler of the Papal States from 14 December 872 to his death. He is often considered one of the ablest popes of the 9th century.
The East–West Schism, also known as the Great Schism or Schism of 1054, is the ongoing lack of communion between the Roman 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, the Pope's claim to universal jurisdiction, and the place of the See of Constantinople in relation to the pentarchy.
Council of Constantinople can refer to the following church councils convened in Constantinople :
Ignatius or Ignatios was a Patriarch of Constantinople from July 4, 847, to October 23, 858, and from November 23, 867, to his death on October 23, 877. In the Catholic Church and Eastern Orthodox churches, he is regarded as a saint, with a feast day of October 23.
The Photian Schism was a four-year (863–867) schism between the episcopal sees of Rome and Constantinople. The issue centred on the right of the Byzantine Emperor to depose and appoint a patriarch without approval from the papacy.
In the history of Christianity, the first seven ecumenical councils include the following: the First Council of Nicaea in 325, the First Council of Constantinople in 381, the Council of Ephesus in 431, the Council of Chalcedon in 451, the Second Council of Constantinople in 553, the Third Council of Constantinople from 680–681 and finally, the Second Council of Nicaea in 787. All of the seven councils were convened in what is now the country of Turkey.
Metrophanes of Smyrna was a Christian bishop, Metropolitan of Smyrna, in the ninth century. He was a leader of the Ignatian bishops at the time of the Photian schism (867).
The East–West Schism that occurred in 1054 represents one of the most significant events in the history of Christianity. It includes various events and processes that led to the schism and also those events and processes that occurred as a result of the schism. Eastern and Western Christians had a history of differences and disagreements, some dating back to the period of Early Christianity. At the very root of what later became the Great Schism were several questions of pneumatology and ecclesiology. The most important theological difference occurred over various questions regarding the procession of the Holy Spirit, and the use of the filioque clause in the Nicene Creed. One of the main ecclesiological issues was the question of papal supremacy. Other points of difference were related to various liturgical, ritual, and disciplinary customs and practices. Some political and cultural processes also contributed to the breakout of the schism.
In the 9th century, Christianity was spreading throughout Europe, being promoted especially in the Carolingian Empire, its eastern neighbours, Scandinavia, and northern Spain. In 800, Charlemagne was crowned as Holy Roman Emperor, which continued the Photian schism.
The history of Eastern Orthodox Christian theology begins with the life of Jesus and the forming of the Christian Church. Major events include the Chalcedonian schism of 451 with the Oriental Orthodox miaphysites, the Iconoclast controversy of the 8th and 9th centuries, the Photian schism (863-867), the Great Schism between East and West, and the Hesychast controversy. The period after the end of the Second World War in 1945 saw a re-engagement with the Greek, and more recently Syriac Fathers that included a rediscovery of the theological works of St. Gregory Palamas, which has resulted in a renewal of Orthodox theology in the 20th and 21st centuries.
Francis Dvornik, in Czech František Dvorník, was a Catholic priest and academic. He is considered one of the leading twentieth-century experts on Slavic and Byzantine history, and on relations between the churches of Rome and Constantinople.
The history of the filioque controversy is the historical development of theological controversies within Christianity regarding three distinctive issues: the orthodoxy of the doctrine of procession of the Holy Spirit as represented by the Filioque clause, the nature of anathemas mutually imposed by conflicted sides during the Filioque controversy, and the liceity (legitimacy) of the insertion of the Filioque phrase into the Nicene Creed. Although the debates over the orthodoxy of the doctrine of procession and the nature of related anathemas preceded the question of the admissibility of the phrase as inserted into the Creed, all of those issues became linked when the insertion received the approval of the Pope in the eleventh century.
The Council of Constantinople of 867 was a major Church Council, convened by Emperor Michael III of Byzantium and Patriarch Photios I of Constantinople in order to address several ecclesiastical issues, including the question of Papal supremacy in the Church, and the use of Filioque clause in the Creed.
The Council of Constantinople of 861, also known as Protodeutera, was a major Church Council, convened upon the initiative of Emperor Michael III of Byzantium and Patriarch Photios I of Constantinople, and attended by legates of Pope Nicholas I. The Council confirmed the deposition of former Patriarch Ignatius of Constantinople, and his replacement by Photios. Several dogmatic, ecclesiological and liturgical questions were also discussed, and seventeen canons were produced. Decisions of the Council were initially approved by papal legates, but their approval was later annulled by the Pope. In spite of that, the Council is considered as valid by the Eastern Orthodox Church.
Catholicismportal 
