Council of HieriaThe iconoclast Council of Hieria was a Christian council of 754 which viewed itself as ecumenical, but was later rejected by the Second Council of Nicaea (787) and by Catholic and Orthodox churches, since none of the five major patriarchs were represented in Hieria. However it is preferred over Second Nicea by some Protestants. The Council of Hieria was summoned by the Byzantine Emperor Constantine V in 754 in the palace of Hieria at Chalcedon.
Quinisext CouncilThe Quinisext Council (Concilium Quinisextum; Penthékti Sýnodos), i.e., the Fifth-Sixth Council, often called the Council in Trullo, Trullan Council, or the Penthekte Synod, was a church council held in 692 at Constantinople under Justinian II. It is known as the "Council in Trullo" because, like the Sixth Ecumenical Council, it was held in a domed hall in the Imperial Palace (τρούλος [] meaning a cup or dome). Both the Fifth and the Sixth Ecumenical Councils had omitted to draw up disciplinary canons, and as this council was intended to complete both in this respect, it took the name of Quinisext.
Nestorian schismThe Nestorian schism (431) was a split between the Christian churches of Sassanid Persia, which affiliated with Nestorius, and those that later became the Catholic and Orthodox churches. The schism rose out of a Christological dispute, notably involving Cyril (Patriarch of Alexandria) and Nestorius (Patriarch of Constantinople). The First Council of Ephesus in 431 and the Council of Chalcedon in 451 condemned Nestorius and his doctrine, which emphasized the radical distinctness between Christ's human and divine natures.
EcumeneIn ancient Greece, the term ecumene (U.S.) or oecumene (UK; ) denoted the known, inhabited, or habitable world. In Greek antiquity, it referred to the portions of the world known to Hellenic geographers, subdivided into three continents: Africa, Europe, and Asia. Under the Roman Empire, it came to refer to civilization itself, as well as the secular and religious imperial administration. In present usage, it is most often used in the context of "ecumenical" and describes the Christian Church as a unified whole, or the unified modern world civilization.
IconodulismIconodulism (also iconoduly or iconodulia) designates the religious service to icons (kissing and honourable veneration, incense, and candlelight). The term comes from Neoclassical Greek εἰκονόδουλος (eikonodoulos) (from εἰκόνα – icon (image) + δοῦλος – servant), meaning "one who serves images (icons)". It is also referred to as iconophilism (also iconophily or iconophilia from εἰκόνα – icon (image) + φιλέω – love) designating a positive attitude towards the religious use of icons.
Second Council of LyonThe First Council of Lyon, the Thirteenth Ecumenical Council, took place in 1245. The Second Council of Lyon was the fourteenth ecumenical council of the Roman Catholic Church, convoked on 31 March 1272 and convened in Lyon, Kingdom of Arles (in modern France), in 1274. Pope Gregory X presided over the council, called to act on a pledge by Byzantine emperor Michael VIII to reunite the Eastern church with the West. The council was attended by about 300 bishops, 60 abbots and more than a thousand prelates or their procurators, among whom were the representatives of the universities.
