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In page Nineveh:

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It was the largest city in the world for approximately fifty years[2] until the year 612 BC when, after a bitter period of civil war in Assyria, it was sacked by a coalition of its former subject peoples including the Babylonians, Medes, and Scythians. The city was never again a political or administrative centre, but by Late Antiquity it was the seat of an Assyrian Christian bishop of the Assyrian Church of the East.[citation needed] It declined relative to Mosul during the Middle Ages and was mostly abandoned by the 14th century AD after the massacres and dispersal of Assyrian Christians by Tamurlane.