The Council of Chalcedon from the point of view of Christian Orthodoxy and the Monophysite Coptic Orthodox Church.

The thesis deals with the comparison attitudes of two Eastern Christian traditions - Orthodox and Coptic to 4th ecumenical council, which held in 451 in Chalcedon. The Monophysite, or Non- Chalcedonian, Coptic Orthodox Church regards it as return to the heterodox teaching called Nestorianism whilst Eastern Orthodox Church this council considers in accordance with the Orthodox doctrine. For Orthodox Christians Chalcedon represents the breakthrough for a refinement of the Christology, concretely in the doctrine about two natures - divine and human - in single person of Christ which the Copts regard as return to Nestorian heresy which due to its dualism interfered the integrity of the person of Christ. The thesis puts forward the insight into the Council of Chalcedon from both perspectives objectively. The thesis is based on authors which represent Orthodox and Coptic traditions but also on these who researched this issue solely from a historical-theological point of view. I have noted reasons - theological and non-theological - why the Copts reject to accept conclusions of this ecumenical council to this day, among other things. I have tried to point out that Monophysitism, or Miaphysitism - whose way the Copts follow - is not only a heretical teaching from the Orthodox theological point of view but..