Medo-Babylonian conquest of the Assyrian Empire

The Medo-Babylonian conquest of the Assyrian Empire was the last war fought by the Neo-Assyrian Empire, between 626 and 609 BC. Succeeding his brother Ashur-etil-ilani (r. 631–627 BC), the new king of Assyria, Sinsharishkun (r. 627–612 BC), immediately faced the revolt of one of his brother's chief generals, Sin-shumu-lishir, who attempted to usurp the throne for himself. Though this threat was dealt with relatively quickly, the instability caused by the brief civil war may have made it possible for another official or general, Nabopolassar (r. c. 626 – 605 BC), to rise up and seize power in Babylonia.

Source: Wikipedia — Medo-Babylonian conquest of the Assyrian Empire (CC BY-SA 4.0)