concentrate on continuing the vigorous expansion of Assyrian colonies in Anatolia and the Levant, and eventually southern Mesopotamia fell to the Amorites. During the first centuries of what is called the "Amorite period", the most powerful city-states in the south were Isin, Eshnunna and Larsa, together with Assyria in the north. First Babylonian dynasty – Amorite dynasty, 1894–1595 BC Around 1894 BC, an Amorite chieftain named Sumu-abum appropriated a tract of land which included the then relatively small city of Babylon from the neighbouring city-state of Kazallu, of which it had initially been a territory, turning his newly acquired lands into a state in its own right. His reign was concerned with establishing statehood amongst a sea of other minor city-states and kingdoms in the region. However, Sumu-abum appears never to have bothered to give himself the title of King of Babylon, suggesting that Babylon itself was still only a minor town or city, and not worthy of kingship. He was followed by Sumu-la-El, Sabium, and Apil-Sin, each of whom ruled in the same vague manner as Sumu-abum, with no reference to kingship of Babylon itself being made in any written records of the time. Sin-Muballit was the first of these Amorite rulers to be regarded officially as a king of Babylon, and then on only one single clay tablet. Under these kings, the nation in which Babylon lay remained a small nation which controlled very little territory, and was overshadowed by neighbouring kingdoms that were both older, larger, and more powerful, such as; Isin, Larsa, Assyria to the north and Elam to the east in ancient Iran. The Elamites occupied huge swathes of southern Mesopotamia, and the early Amorite rulers were largely held in vassalage to Elam. Empire of Hammurabi Babylon remained a minor town in a small state until the reign of its sixth Amorite ruler, Hammurabi, during 1792–1750 BC (or c. 1728–1686 BC in the short chronology). He conducted major building work in Babylon, expanding it from a small town into a great city worthy of kingship. A very efficient ruler, he established a bureaucracy, with taxation and centralized government. Hammurabi freed Babylon from Elamite dominance, and indeed drove the Elamites from southern Mesopotamia entirely. He then systematically conquered southern Mesopotamia, including the cities of Isin, Larsa, Eshnunna, Kish, Lagash, Nippur, Borsippa, Ur, Uruk, Umma, Adab, Sippar, Rapiqum, and Eridu. His conquests gave the region stability after