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In page Sinsharishkun:

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Although it has been a commonly circulated idea that one of the primary reasons that led to the fall of the Neo-Assyrian Empire was a civil war between Ashur-etil-ilani and Sinsharishkun over the throne which weakened Assyria, there is no contemporary text which suggests that this is true. No inscriptions mention a war or even a dispute between the two brothers. There were revolts at the beginnings of both the reign of Ashur-etil-ilani and Sinsharishkun, but these were minor and dealt with relatively quickly. As such, protracted civil war between contenders to the Assyrian throne was probably not the reason for Assyria's fall.[1]