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
Hadon of Ancient Opar was still deep in the Stone Age. Farmer shows this culture at or near the peak of its ancient glory, more than 10,000 years ago. It comprises numerous thriving (and sometimes warring) city states and empires, one of which is Opar. Opar is, in fact, far from the most important of these cities. The Opar described in the Tarzan novels is depicted as a "former colony of Atlantis" and this is adhered to by Farmer, though "Atlantis" in this context—the capital of the empire of which Opar is a province—is located on an island in the African inland sea, not