page_title: Council of Chalcedon
hierarchical_section_title: Council of Chalcedon
caption_attribution_description: English: Location map of Istanbul Português: Mapa de localização de Istambul Ελληνικά: Χάρτης τοποθεσιών για τη Κωνσταντινούπολη This map of Istanbul was created from OpenStreetMap project data, collected by the community. This map may be incomplete, and may contain errors. Don't rely solely on it for navigation.
context_page_description: The Council of Chalcedon was a church council held from 8 October to 1 November, 451, at Chalcedon, a town of Bithynia in Asia Minor. The Council was called by Emperor Marcian to set aside the 449 Second Council of Ephesus. Its principal purpose was to assert the orthodox catholic doctrine against the heresy of Monophysitism and Eutyches, although ecclesiastical discipline and jurisdiction also occupied the council's attention.
  The council is numbered as the fourth ecumenical council by the Catholic Church, the Eastern Orthodox Church, and most Protestants. Oriental Orthodox Churches do not agree with the conduct and the proceedings of the Council, commonly calling it "Chalcedon, the Ominous". This disagreement led the Oriental Orthodox Churches to separate from the rest of Christianity after the Council of Chalcedon.
  Followers of the Council believe its most important achievement was to issue the Chalcedonian Definition, stating that Jesus is "perfect both in deity and in humanness; this selfsame one is also actually God and actually man." The council's judgments and definitions regarding the divine marked a significant turning point in the Christological debates.
context_section_description: The Council of Chalcedon (/kælˈsiːdən, ˈkælsɪdɒn/; Latin: Concilium Chalcedonense; Greek: Σύνοδος της Χαλκηδόνας, Synodos tēs Chalkēdonas) was a church council held from 8 October to 1 November, 451, at Chalcedon, (modern Kadıköy in Istanbul, Turkey) a town of Bithynia in Asia Minor. The Council was called by Emperor Marcian to set aside the 449 Second Council of Ephesus. Its principal purpose was to assert the orthodox catholic doctrine against the heresy of Monophysitism and Eutyches, although ecclesiastical discipline and jurisdiction also occupied the council's attention. 
  The council is numbered as the fourth ecumenical council by the Catholic Church, the Eastern Orthodox Church, and most Protestants. Oriental Orthodox Churches do not agree with the conduct and the proceedings of the Council, commonly calling it "Chalcedon, the Ominous". This disagreement led the Oriental Orthodox Churches to separate from the rest of Christianity after the Council of Chalcedon.
  Followers of the Council believe its most important achievement was to issue the Chalcedonian Definition, stating that Jesus is "perfect both in deity and in humanness; this selfsame one is also actually God and actually man." The council's judgments and definitions regarding the divine marked a significant turning point in the Christological debates.
caption: Chalcedon marked on a map of the Istanbul region
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