The date of these early Babylonian rulers, of course, is, as yet, not accurately determined. The relative age of each is made out chiefly from palaeographic evidences (see EBH. p. 8, for example), supplemented with the attempt at fitting into one harmonious whole the events which the inscriptions of these rulers divulge. Then the whole schedule is crowded backward or forward or internally changed from time to time as new evidence is gathered for or against the testimony of Nabonidus (555-538 B. C.) who, when he discovered the tablet of Narâm-Sin, declared that he was gazing on that which no eyes had beheld for thirty-two hundred years. Nabonidus says: “I dug to a depth of eighteen cubits, and the foundation of Narâm-Sin, the son of Sargon, which for thirty-two hundred years no king that had preceded me had discovered, Šamaš, the great Lord of E-barra, permitted me, even me, to behold.”[11] On the supposed relation of these kings to Narâm-Sin, the rulers En-šag-kušanna, a king of the south, Urukagina, of Lagaš, and Mesilim, a king ruling at Kîš, are placed along about the date of 4500 B. C., while Eannatum, Enannatum and Entemena, successive rulers at Lagaš, are placed near the date of 4200 B. C. Lugalzaggisi of Erech is placed at 4000 B. C. It may be stated here that the date of Sargon I. as 3800 B. C. is obtained by adding to 3200 the date of the reign of Nabonidus as 550 years B. C. and also the length of the reign of Sargon I. as 50 years. The seat of Bêl’s cult was Nippur, a city lying between the Euphrates and Tigris, a little below Babylon, and located, as it were, in the midway favorable to receiving homage from kings of either the north or the south of Babylonia. We find it mentioned as early as the time of Entemena, who in one of his inscriptions, in speaking of something presented to Bêl, says: “To Bêl of Nippur by Entemena it was presented”.[12] In the bilingual legend of the Creation, Nippur seems to be regarded as a very old city. It is placed at the head of the list of three that are mentioned as ancient cities of Babylonia. “Nippur was not made; E-kur was not built. Erech was not made; E-anna was not built. The abyss was not made; Eridu was not built.”[13] Nippur evidently is older than the worship of Bêl and the conception of Bêl is older than the first king of whom we have mention; viz., En-šag-kušanna, who is placed at 4500 B. C.