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EarlierTheodosian Walls Completed447 CE
LaterHagia Sophia Becomes World's Largest Interior Space537 CE

The Council of Chalcedon (Latin: Concilium Chalcedonense) was the fourth ecumenical council of the Christian Church. It was convoked by the Roman emperor Marcian. The council convened in the city of Chalcedon, Bithynia (modern-day Kadıköy, Istanbul, Turkey) from 8 October to 1 November 451.

Key figuresMarcian
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