Several cities had been founded at a remote time and these now grew rapidly in importance. Each was built around a temple dedicated to some particular divinity. Eridu worshipped the god EA, father of waters; Ur was sacred to Sin, the moon-god, and later kings, of the dynasty of Ur, added the name Sin to their own, as for example, Ine-Sin, Pur-Sin. Larsam was sacred to the sun-god Shamash; Uruk to the goddess Ishtar; Nippur to En-lil, father of the gods, and so on. Each city believed that its god--Bel or Lord--was the greatest of all gods, and often its inhabitants were inspired to go out to conquer other cities and territories in order to extend the prestige of the local deity. Probably at the same time the people were stimulated to fight because certain cities had grown up in the very heart of the fertile valley, while others had been obliged to locate in poorer sections. Naturally these last looked with envious eyes upon the richer soil of their neighbors, and desired to win it for themselves. Each city watched for the first sign of weakness in her sister cities, and when it appeared, tried at once to incorporate them into her own domains. The political history of the Euphrates valley before the dominance of Babylon is the history of these cities as they grew into little states. Some grew strong; others weakened and became tributary to the more vigorous few. En-shag-kush-ana, "Lord of Kengiu," was the name of the first king to appear in the Babylonian records. Erech was probably his capital, and Nippur the religious center of his little kingdom. We have already connected Nippur with the excavations made by the University of Pennsylvania. The ruins there unearthed have enabled scholars to understand in the main sacred cities of Babylonia. En-shag-kush-ana was priest as well as king. Although his race was not mentioned, he was probably a Chaldean, like the people over whom he ruled. A little to the north, a Semitic kingdom with the city Kish as its head, was growing rapidly in power, and threatened to absorb even Erech itself. On this account, Chaldeans attacked it and gained the victory, whereupon their god, En-lil of Nippur was celebrated in festival and his temple received numerous trophies of the triumph, since he had enabled those of the south to overcome the cruder Semitic city. Their defeat only led the Semitic kingdom of Kish to strengthen its forces, and about 4000 B.C., under leadership of Lugalzaggisi, the vigor of the new race overcame the nearly expended force of the Chaldeans. This conquering Semitic king set forth his position thus: "Lugalzaggisi, king of Erech, king of the world, priest of Ana, hero of Nidaba, son of Ukush, he who is looked upon favorably by the faithful eye of En-lil.