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In page Sinsharishkun:

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In April or May 612 BC, at the start of Nabopolassar's fourteenth year as King of Babylon, the combined Medo-Babylonian army marched on Nineveh. From June to August of that year, they besieged the Assyrian capital and in August the walls were breached, leading to a lengthy and brutal sack.[3] Sinsharishkun's fate is not entirely certain but it is commonly accepted that he died in the defense of Nineveh.[4][5]