The mention of the deity in an inscription of Ur-Bau, who calls himself the 'beloved servant' of this god, would be due to the circumstance that the district within which the city in question lay was controlled by the rulers of Lagash.
To invoke as large a number of deities as possible was not only a means of securing protection from many sides, but was already in the early days of Babylonian history indulged in by rulers, as a means of emphasizing the extent and manifold character of their jurisdiction.
Nin-e-gal and Ningal.
A temple was erected to Nin-e-gal by the wife of Rim-Sin, of the dynasty ruling in Larsa.

Her name as interpreted in the tablet dedicated to her, signifies again, as in several cases already noted, 'great lady.' She was probably therefore only the consort of some patron deity; and Nannar being the most prominent god invoked by Rim-Sin, it would seem that the goddess to whom the queen pays her respects is again one of the consorts of the moon-god.[87] This conclusion is supported by the direct association of Nannar of Ur and Ningal in an inscription emanating from an earlier member of the same dynasty to which Rim-Sin belongs.
Nur-Ramman speaks of building temples to these deities in the city of Ur.

Hence the goddess is also represented as interceding with Sin on behalf of those who appeal to her.

The form Nin-e-gal is but a variant of Nin-gal, so that the identification of the two lies beyond doubt, and it may very well be that the temple erected by the consort of Rim-Sin is the same as the one referred to by Nur-Ramman.

In a land where polygamy was a prevailing custom, the gods too might be represented as having a number of consorts.