East-West Schism
Also known as East–West Schism, Great Schism, Schism of 1054, Eastern Schism, Schism
division of Christianity into two large parts in 1054
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The East-West Schism was the split of Christianity into Eastern Orthodox and Roman Catholic churches in 1054, marking a major break between the Christian communities of the Eastern Byzantine Empire and the Western Roman Church. This division matters because it created two separate Christian traditions with different practices, leadership structures, and theological emphases that have remained distinct for nearly 1,000 years.
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The East–West Schism, also known as the Great Schism or the Schism of 1054, is the break of communion between the Catholic Church and the Eastern Orthodox Church since 1054. A series of ecclesiastical differences, theological disputes and geopolitical tensions between the Greek East and Latin West preceded the formal split 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. Although 1054 has become conventional, various scholars have proposed different dates for the Great Schism, including 1009, 1204, 1277, and 1484.
The first action that led to a formal schism occurred in 1053 when Patriarch Michael I Cerularius of Constantinople ordered the closure of all Latin churches in Constantinople. In 1054, the papal legate sent by Leo IX travelled to Constantinople to deny Cerularius the title of "ecumenical patriarch" and insist that he recognize the pope's claim to be the head of all of the churches, and to seek help from the Byzantine emperor, Constantine IX Monomachos, in view of the Norman conquest of southern Italy, and to respond to Leo of Ohrid's attacks on the use of unleavened bread and other Western customs, attacks that had the support of Cerularius. When the leader of the legation, Cardinal Humbert of Silva Candida, learned that Cerularius had refused to accept the demand, he excommunicated him, and in response Cerularius excommunicated Humbert and the other legates.