Ecumenical Patriarchate in the context of "Holy Doors"

The Byzantine Iconoclasm (Ancient Greek: Εἰκονομαχία, romanized: Eikonomachía, lit. 'image struggle', 'war on icons') are two periods in the history of the Byzantine Empire when the use of religious images or icons was opposed by religious and imperial authorities within the Ecumenical Patriarchate (at the time still comprising the Roman-Latin and the Eastern-Orthodox traditions) and the temporal imperial hierarchy. The First Iconoclasm, as it is sometimes called, occurred between about 726 and 787, while the Second Iconoclasm occurred between 814 and 842. According to the traditional view, Byzantine Iconoclasm was started by a ban on religious images promulgated by the Byzantine Emperor Leo III the Isaurian, and continued under his successors. It was accompanied by widespread destruction of religious images and persecution of supporters of the veneration of images. The Papacy remained firmly in support of the use of religious images throughout the period, and the whole episode widened the growing divergence between the Byzantine and Carolingian traditions in what was still a unified European Church, as well as facilitating the reduction or removal of Byzantine political control over parts of the Italian Peninsula.

Iconoclasm is the deliberate destruction within a culture of the culture's own religious images and other symbols or monuments, usually for religious or political motives. People who engage in or support iconoclasm are called iconoclasts, Greek for 'breakers of icons' (εἰκονοκλάσται), a term that has come to be applied figuratively to any person who breaks or disdains established dogmata or conventions. Conversely, people who revere or venerate religious images are derisively called "iconolaters" (εἰκονολάτρες). They are normally known as "iconodules" (εἰκονόδουλοι), or "iconophiles" (εἰκονόφιλοι). These terms were, however, not a part of the Byzantine debate over images. They have been brought into common usage by modern historians (from the seventeenth century) and their application to Byzantium increased considerably in the late twentieth century. The Byzantine term for the debate over religious imagery, iconomachy, means "struggle over images" or "image struggle". Some sources also say that the Iconoclasts were against intercession to the saints and denied the usage of relics; however, it is disputed.

The American Carpatho-Russian Orthodox Diocese of North America (ACROD) is a archdiocese of the Ecumenical Patriarchate in the United States and Canada. Though the diocese is directly responsible to the Patriarchate, it is under the spiritual supervision of the Primate of the Greek Orthodox Archdiocese of America. As of 2010, there are 79 parishes with 10,400 adherents, of which 4900 regularly attend. There are no monasteries.The diocese was led by Metropolitan Nicholas (Smisko) of Amissos (1936–2011). The current leader is the Metropolitan of Nyssa, Gregory (Tatsis), who was consecrated on November 27, 2012.

Rūm millet (Ottoman Turkish: millet-i Rûm, lit. 'Roman nation') was the name of the Eastern Orthodox Christian community in the Ottoman Empire, and often Anatolia in particular. Despite being subordinated within the Ottoman political system, the community maintained a certain internal autonomy.

Josaphat Kuntsevych, OSBM (c. 1580 – 12 November 1623) was a Basilian hieromonk and archeparch of the Ruthenian Greek Catholic Church who served as Archbishop of Polotsk from 1618 to 1623. On 12 November 1623, he was beaten to death with an axe during an anti-Catholic riot by Eastern Orthodox Belarusians in Vitebsk, in the eastern peripheries of the Polish–Lithuanian Commonwealth.

His death reflects the conflict between the Eastern Orthodox Church and the Eastern Catholic Churches that intensified after four Ruthenian Orthodox Church (Kiev Metropolitanate) bishops transferred their allegiance from the Ecumenical Patriarchate in Constantinople to the Holy See, under the terms laid down by the 1439 Council of Florence, by signing the 1596 Union of Brest. Archeparch Josaphat remains one of the best-known victims of anti-Catholic violence for his role in both personally accepting and very effectively spreading the Eastern Catholic Churches as a hieromonk and bishop, and was canonized in 1867 by Pope Pius IX as a saint and a martyr of the Catholic Church.