(from  http://www.coptic.net/EncyclopediaCoptica/ )

Under the authority of the Eastern Roman Empire of Constantinople (as opposed to the western empire of Rome), the Patriarchs and Popes of Alexandria played leading roles in Christian theology. They were invited everywhere to speak about the Christian faith. Saint Cyril, Pope of Alexandria, was the head of the Ecumenical Council which was held in Ephesus in the year 430 A.D. It was said that the bishops of the Church of Alexandria did nothing but spend all their time in meetings. This leading role, however, did not fare well when politics started to intermingle with Church affairs. It all started when the Emperor Marcianus interfered with matters of faith in the Church. The response of Saint Dioscorus, the Pope of Alexandria who was later exiled, to this interference was clear: "You have nothing to do with the Church." These political motives became even more apparent in Chalcedon in 451, when the Coptic Church was unfairly accused of following the teachings of Eutyches, who believed in monophysitism. This doctrine maintains that the Lord Jesus Christ has only one nature, the divine, not two natures, the human as well as the divine. The Coptic Church has never believed in monophysitism the way it was portrayed in the Council of Chalcedon! In that Council, monophysitism meant believing in one nature. Copts believe that the Lord is perfect in His divinity, and He is perfect in His humanity, but His divinity and His humanity were united in one nature called "the nature of the incarnate word", which was reiterated by Saint Cyril of Alexandria. Copts, thus, believe in two natures "human" and "divine" that are united in one "without mingling, without confusion, and without alteration" (from the declaration of faith at the end of the Coptic divine liturgy). These two natures "did not separate for a moment or the twinkling of an eye" (also from the declaration of faith at the end of the Coptic divine liturgy).

The Coptic Church was misunderstood in the 5th century at the Council of Chalcedon. Perhaps the Council understood the Church correctly, but they wanted to exile the Church, to isolate it and to abolish the Egyptian, independent Pope, who maintained that Church and State should be separate. Despite all of this, the Coptic Church has remained very strict and steadfast in its faith. Whether it was a conspiracy from the Western Churches to exile the Coptic Church as a punishment for its refusal to be politically influenced, or whether Pope Dioscurus didn't quite go the extra mile to make the point that Copts are not monophysite, the Coptic Church has always felt a mandate to reconcile "semantic" differences between all Christian Churches. This is aptly expressed by the current 117th successor of Saint Mark, Pope Shenouda III: "To the Coptic Church, faith is more important than anything, and others must know that semantics and terminology are of little importance to us." Throughout this century, the Coptic Church has played an important role in the ecumenical movement. The Coptic Church is one of the founders of the World Council of Churches. It has remained a member of that council since 1948 A.D. The Coptic Church is a member of the all African Council of Churches (AACC) and the Middle East Council of Churches (MECC). The Church plays an important role in the Christian movement by conducting dialogues aiming at resolving the theological differences with the Catholic, Eastern Orthodox, Presbyterian, and Evangelical Churches.

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