Which was the capital city of the Assyrian Empire?
Timeline of the Assyrian Empire affected the Assyrian morale. Ashur-uballit II (612- 609 BC) took the throne amid the street by street fighting in Nineveh and refused a request to bow in vassalage to Nabopolassar, Cyaxares and their allies. He managed to break out of Nineveh and successfully fight his way to the northern Assyrian city of Harran, and founded it as a new capital. Ashur-uballit II somehow managed to keep control of a now greatly reduced Assyria for three years or so, repelling attacks by his enemies. However, Harran too was eventually besieged and taken by the Medes, Babylonians and Scythians in 609 BC.
Timeline of the Assyrian Empire in Ashur began deteriorating, Tukulti-Ninurta built a new capital city; Kar-Tukulti-Ninurta. He stretched the Assyrian Empire further south than before, conquering Dilmun, a "pre-Arab" civilisation of the Arabian Peninsula that encompassed modern Bahrain, Kuwait, Qatar and the coastal regions of the Eastern Province of Saudi Arabia. However, Tukulti-Ninurta's sons rebelled and besieged the ageing king in his capital. He was murdered and then succeeded by Ashur-nadin-apli (1206–1203 BC) who left the running of his empire to Assyrian regional governors such as Adad-bēl-gabbe. Another unstable period for Assyria followed, it was riven by periods of internal strife and the new king