Pope Leo I, painted by Francisco Herrera the Younger. His Tome shaped the council’s definition.Image: Francisco Herrera the Younger · Public domainThe Council of Chalcedon opens
The fourth ecumenical council of the Christian church opened on 8 October 451 at Chalcedon, a city of Bithynia in Asia Minor across the water from Constantinople, and sat until 1 November. About 520 bishops or their representatives attended, which made it the largest and the best documented of the early councils. Its main business was to settle how the divine and human natures of Christ were to be described, against the teaching of Eutyches; the definition it produced, drawing on Pope Leo’s Tome, is still the standard of most of the Christian churches, though it also caused a lasting split with those who rejected it.
Source: Encyclopaedia Britannica: Council of Chalcedon ↗
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