Video : Constantine I shifts Roman capital to Byzantium, later known as Constantinople for Eastern Empire.

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Constantinople

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| Artist: File:Hagia_Sophia_Southwestern_entrance_mosaics.jpg: Photograph: Myrabella derivative work: Myrabella | Credit: This file was derived from: Hagia Sophia Southwestern entrance mosaics.jpg:  | Description: Emperor Constantine I, presenting a model of the Constantinople basilica Hagia Sophia to the Blessed Virgin Mary. Detail of the southwestern entrance mosaic in Hagia Sophia (Istanbul, Turkey).

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