<P> The Council of Chalcedon was convened by Emperor Marcian , with the reluctant approval of Pope Leo the Great , to set aside the 449 Second Council of Ephesus which would become known as the `` Latrocinium '' or `` Robber Council '' . The Council of Chalcedon issued the Chalcedonian Definition , which repudiated the notion of a single nature in Christ , and declared that he has two natures in one person and hypostasis . It also insisted on the completeness of his two natures : Godhead and manhood . The council also issued 27 disciplinary canons governing church administration and authority . In a further decree , later known as canon 28 , the bishops declared that the See of Constantinople ( New Rome ) had the same patriarchal status as the See of Rome . </P>
why did the council of chalcedon take place
to set aside the 449 Second Council of Ephesus