In studying such a list as that presented by Gudea, we must, therefore, make due allowance for what may be called local peculiarities and local conditions. It is only by comparing his list with others that we can differentiate between the general features of Babylonian cults and the special features due to political and local associations. We are in a position now to institute this comparison for a period which is certainly some centuries earlier than Gudea. The date of the reign of Lugal-zaggisi, king of Uruk, who has been several times referred to in a previous chapter, is fixed by Hilprecht at _c._ 4500 B.C., but it is doubtful whether so high an age will be accepted by scholars. The chronology for the period beyond Gudea is still in a very uncertain condition. Lugal-zaggisi, in a long list of deities at the beginning of an important inscription, enumerates in succession Anu, the goddess Nisaba, the gods En-lil (or Bel), En-ki (=Ea), En-zu (Sin), Utu (the sun-god), the goddess Ninni (or Nana(?)), Nin-khar-sag, Umu, and Nin-akha-kuddu. As for Anu, the king introduces the name, as Ur-Ningirsu of Lagash does (see above, p. 90), in calling himself 'priest of Anu,' and which, according to the explanation suggested, means simply 'divine priest.' Bel, Ea, Sin, and Shamash (or Utu) are common to Gudea and Lugal-zaggisi. These constitute, then, the great gods whose worship is no longer limited to any particular district. They have become common property, in part through the sanctity attached to the places where the gods were worshipped, in part through the antiquity of these places, and in part, no doubt, as the result of a political development lying behind the period under consideration. The prominence given by Lugal-zaggisi to Nisaba is rather surprising. He calls himself and also his father, 'hero' of Nisaba. If, however, it be borne in mind that of the goddesses at least two, Umu and Nin-akha-kuddu, are of a local character, the conclusion appears justified that Nisaba was a goddess associated more particularly with the district in which Uruk lay. The goddess Ninni (written simply as 'the goddess') is no doubt identical with the great Nana of Uruk, and Nin-khar-sag is introduced as the consort of En-lil.