A split between the Eastern and Western Christian churches in the 9th century. In 858, the lay scholar Fotius was appointed Patriarch of Constantinople by the Byzantine Emperor Mikhail III to replace the dismissed Ignasius, Pope Nicholas I of Rome (Nicholas I, reigned 858-867) ) Refused to recognize and excommunicated Fotius (863). Fotius believed that the Patriarch of Constantinople was not under the pope. In 867, he accused the Western Church of “heresy” and condemned its presence. The creed added the "harmony clause" and sent Latin missionaries to Bulgaria to excommunicate the pope, which is known as the "Futius split" in history. In 867, Mihaier III was slain, and Fotiou was helpless. Following the throne, Basil I repaired with the Pope. In 869, he convened the fourth Council of Constantinople to excommunicate Fotiu, but in 877, the emperor Fotiund was favored and reinstated as the patriarch, and a meeting was held in 879. Deny the Fourth Council of Constantinople and sever relations with the Holy See. After Leo VI became the Byzantine emperor in 886, Fottius was exiled again.
