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In page Nineveh:

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It was the largest city in the world for approximately fifty years 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 a bishop of the Church of the East. 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 Timur.[citation needed]