sentences:  During the reign of Sinsharishkun (622–612 BC), the Assyrian empire, which had been in a state of constant civil war since 626 BC, began to unravel.Subject peoples, such as the Medes, Babylonians, Chaldeans, Egyptians, Scythians, Cimmerians, Lydians and Arameans quietly ceased to pay tribute to Assyria.Neo-Assyrian dominance over the Medians came to an end during the reign of Median King Cyaxares, who, in alliance with King Nabopolassar of the Neo-Babylonian Empire, attacked and destroyed the strife-riven empire between 616 and 609 BC.