The Council of Chalcedon was a church council held from 8 October to 1 November, 451 AD, at Chalcedon

Chalcedon

Chalcedon , sometimes transliterated as Chalkedon) was an ancient maritime town of Bithynia, in Asia Minor, almost directly opposite Byzantium, south of Scutari . It is now a district of the city of Istanbul named Kadıköy...

 (a city of Bithynia

Bithynia

Bithynia was an ancient region, kingdom and Roman province in the northwest of Asia Minor, adjoining the Propontis, the Thracian Bosporus and the Euxine .-Description:...

 in Asia Minor

Asia Minor

Asia Minor is a geographical location at the westernmost protrusion of Asia, also called Anatolia, and corresponds to the western two thirds of the Asian part of Turkey...

), on the Asian side of the Bosporus

Bosporus

The Bosphorus or Bosporus , also known as the Istanbul Strait , is a strait that forms part of the boundary between Europe and Asia. It is one of the Turkish Straits, along with the Dardanelles...

. The council marked a significant turning point in the Christological debates that led to the separation of the church of the Eastern Roman Empire in the 5th century. It is the last council which many Anglicans and most Protestants consider ecumenical.

The Council of Chalcedon was convened by Flavian

Patriarch Fravitta of Constantinople

Fravitta was the patriarch of Constantinople . He is regarded as a saint, and has a feast day of February 18.-Biography:...

's successor, Anatolius

Patriarch Anatolius of Constantinople

Saint Anatolius was Patriarch of Constantinople . He became Patriarch through the influence of Pope Dioscorus I of Alexandria with Emperor Theodosius II, after the deposition of Flavian by the Second Council of Ephesus, having previously been the apocrisiarius or representative of Dioscorus with...

, at Pope Leo I's urging, to set aside the 449 Second Council of Ephesus

Second Council of Ephesus

The Second Council of Ephesus was a church synod in 449 AD. It was convoked by Emperor Theodosius II as an ecumenical council but because of the controversial proceedings it was not accepted as ecumenical, labelled a Robber Synod and later repudiated at the Council of Chalcedon.-The first...

, better known as the "Robber Council

Latrocinium

Latrocinium which meant primarily a mercenary, or hired soldier, had the same meaning as miles. Latrocinium applied to a war that was not preceded by a declaration of war under the Roman laws; it was also applied to the guerrilla warfare used by the enemies of Rome...

".