the Week of Proper 20 / Ordinary 25
Council of Chalcedon
1910 New Catholic Dictionary
The Fourth AEcumenical Council, held, A.D. 451, in the pontificate of Leo I, at Chalcedon, a city of Bithynia, in Asia Minor. The principal purpose of the Council was to define the Catholic doctrine on the two natures of Christ, against the Monophysite heresy.
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Entry for 'Council of Chalcedon'. 1910 New Catholic Dictionary. https://www.studylight.org/​dictionaries/​eng/​ncd/​c/council-of-chalcedon.html. 1910.