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When reports of the actions of the Dioscurus led council and the violent actions of his partisans reached Pope Leo he condemned the council and called it the ''Latrocinium'', a ''Robber Council'' and refused to recognize Anatolius as the lawful Bishop of Constantinople until he satisfactorily explained his belief. Theodosius, however, ignored the position of Leo. On [[July 28]], 450, the situation changed radically as Theodosius was killed in a horse accident and his sister Pulcheria returned to imperial power and married the general [[Marcian]], who became the new emperor. The empress and new emperor both opposed the teachings of Dioscurus and Eutyches. With the change in imperial leadership Anatolius and many other bishops now also condemned the teachings of Dioscurus and Eutyches. As a step to clarify the disputes Marician now called for a new council which was held in 451 in [[Chalcedon]].  ===Worthy to note===It is beleived that many of these reasons that caused this great schism to be political and due to different interpretations of languages. The Coptic Orthodox Church never beleived in [[Monophystism]] as it was claimed. It always beleived that Christ is one ''from'' two natures, i.e. [[Miaphysitism]]. In other words, Christ is a full human and a full God, both natures are united without separation, confusion, or alteration. This can be noted in the confession part in the Coptic Divine Liturgy "... He made It one with His divinity without mingling, without confusion, and without alteration ..." which is what [[Cyril of Alexandria]] and [[Dioscorus of Alexandria]] said but was lately misunderstood to be in favour of [[Monophysitism]] or [[Eutychianism]].  The dialogues between Oriental and Eastern Orthodox Churches started again in the 20th century after more than 15 centuries of seperation. During these dialogues, both parties found that they agree on many theological terms and definitions including this point that seperated them in the first place which came in favour to the opinions suggested that factors such as politics intervened in their seperation. <ref>[http://www.orthodoxunity.org/official.php Orthodox Unity - Statements from the Dialogue between the Eastern and Oriental Orthodox Churches]</ref>