Nippur, or Enlil ('lord wind'), is modern Nuffar in Iraq. Nippur was one of the most ancient of all the Sumerian cities. It was the special seat of the worship of the Sumerian god, Enlil, ruler of the cosmos (universe), and subject to An alone.
Nippur was always part of a larger empire. Its control was crucial, as it gave overall 'kingship' to monarchs from other city-states. It was a sacred city, important because it had the famous shrine of Enlil.
Late in the 3rd millennium BC, Nippur was conquered and occupied by the Semitic rulers of Akkad, and their rulers, like Sargon, left gifts at this sanctuary. Another ruler, Naram-Suen, rebuilt the temple and the city walls; in the debris of this ancient site his remains were found. This Akkadian occupation was succeeded by an occupation during the third dynasty of Ur, and the constructions of Ur-Nammu, the great builder of temples, are on top of those of Naram.