The mound of Kuyunjik in Mosul is the site of the palaces of King Sennacherib, and his successors Esarhaddon, Ashurbanipal, (who established the Library of Ashurbanipal), Ashur-etil-ilani, Sin-shumu-lishir and Sin-shar-ishkun. The Assyrian Empire began to unravel from 626 BC onwards, being consumed by a decade of brutal internal civil wars, greatly weakening it. A war-ravaged Assyria was subsequently attacked in 616 BC by a vast coalition of its former subjects, most notably their Babylonian relations from southern Mesopotamia, together with the Medes, Persians, Chaldeans, Scythians, Cimmerians, and Sagartians. Nineveh fell after a siege and bitter house to house fighting in 612 BC during the reign of Sin-shar-ishkun who was killed defending his capital. His successor, Ashur-uballit II, fought his way out of Nineveh and formed a new Assyrian capital at Harran (now southeastern Turkey).