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
Historiography of the fall of the Western Roman Empire ancient Roman remains have been shown to have been less than half that of modern Europeans which have concentrations between 20-50ppm. The role and importance of lead poisoning in contributing to the fall of the Roman Empire is the subject of controversy and its importance and validity is discounted by many historians. John Scarborough, a pharmacologist and classicist, criticized Nriagu's book as "so full of false evidence, miscitations, typographical errors, and a blatant flippancy regarding primary sources that the reader cannot trust the basic arguments." He concluded that ancient authorities were well aware of lead poisoning and that it was