Ur was one of the important sumerian capitals. It was the capital of Mesopotamia, the cradle of civilization at the end of the third millennium B.C. and it was already an important commercial center by the time of the first dynasty. A long period of decline was followed by the brilliant-reign of ur-Nammu, the founder of the 3rd Dynasty of Ur (C.2125 B.C.) . Ur was surrounded by an oval wall, many structures were, known7 The prominent ruin is the great ziggurat dedicated to the moon god Nanner. The first dynasty of Ur is known by the Royal cemetery (almost nothing is known of Ur7 s 2nd Dynasty) . The third dynasty is known by the ziggurat which is the first one in mesopotamia. Ur was still occupied until the Neo-and late Babylonian period.