But the importance of Lagash was soon to pass away, and Ur became the dominating power in Babylonia. The dynasty of Ur (_circ._ 2400 B.C.), which lasted close on 120 years, was founded by Ur-Engur. He included the whole of Southern Babylonia within his sphere of influence, while in the north, he has left evidence of his architectural undertakings at Nippur; hence he styled himself the “King of Sumer and Akkad,” but the fact that his son and successor Dungi found it necessary to reduce Babylon indicates that his authority in Akkad was not unquestioned. Dungi reigned 58 years, during which he reduced the whole of Babylonia beneath his sway, and apparently annexed the greater part of Elam. So firmly had he established his control over Elam, that we find the capital of that country (Susa) still retained by his successors, though frequent expeditions had to be undertaken to maintain the “status quo.” The dynasty of Ur would appear to have been brought to an end by an invasion of Elamites; at all events Ibi-Sin, the last king of Ur, was carried away by the Elamites, and the rule in Babylonia then passed to the city of Isin. The dynasty of Isin lasted some 225 years, during which Babylonia enjoyed great prosperity. In the latter part of the first half of this period the power in Babylonia seems to have passed temporarily into the hands of Gungunu, king of Ur and Larsa, who laid claim to rule over the whole of Sumer and Akkad, but his supremacy was of short duration, and Isin soon recovered her position as the paramount power in Babylonia. Meanwhile the Semitic element in the north was gradually regaining its ascendency, and finally asserted itself as a concrete fact in the establishment of a dynasty by Sumu-abu, at the city of Babylon itself, about 2000 B.C. At about this time the Elamites established themselves in Southern Babylonia at Ur and Larsa under Kudur-Mabuk and his sons Arad-Sin and Rîm-Sin, and during the earlier part of the dynasty exercised a suzerainty over the whole of that region. Subsequently Rîm-Sin met with a severe defeat at the hands of Khammurabi, the most illustrious king of the dynasty and the Amraphel of the Book of Genesis, while he met with his death at the hands of Samsu-iluna, Khammurabi’s successor. With the death of Rîm-Sin Elamite power in Babylonia came to an end. Khammurabi consolidated the power of Babylon, and extended his influence on all sides, but his chief title to fame depends upon his codification of Babylonian law. But Babylon’s supremacy in the south was soon to be successfully challenged by Iluma-ilu who founded a kingdom on the shores of the Persian Gulf, and inaugurated the so-called “Second Dynasty” of the lists of the kings.