Istar at the outset was the spirit of the evening star. In days, however, when astronomy was as yet in its infancy, the evening and the morning stars were believed to be the same. It was only in aftertimes that an endeavour was made to distinguish between the Istar of the evening and the Istar of the morning. Originally they were one and the same, the herald at once of night and day. It was on this account that Istar was associated with Ana, the sky. The sky was her father, for she was born from it at sunset and dawn; and if other traditions or myths made her the daughter of the moon-god, they were not accepted at Erech, the centre and source of her cult.
In virtue of her origin she formed a triad with Samas and Sin. The sun, the moon, and the evening star divided, as it were, the heavens between them, and presided over its destinies. They were the luminaries that regulated the seasons of the year and determined the orderly course of the present creation. Istar represents "the stars " of Genesis that were made with the sun and moon. But in the Babylonian system the triad of Istar, Sin, and Samas was not made, they were deities that were born. Before them was the older and higher triad of Anu, Bel, and Ea,--the sky, the earth, and the water,--the three elements of which the whole universe was formed.
How the spirit of the evening star came in time to be the goddess of love, is not difficult to understand. Even modern poets have sung of the evening as the season of lovers, when the work and business of the day are over, and words of love can be whispered under the pale light of the evening star. But this alone will not explain the licentious worship that was carried on at Erech in the name of Istar. It was essentially Semitic in its character, and illustrates that intensity of belief which made the Semite sacrifice all he possessed to the deity whom he adored. The prostitution that was practised in the name of Istar had the same origin as the sacrifice of the firstborn, or the orgies that were celebrated in the temples of the sun-god.
At Erech, Istar was served by organised bands of unmarried maidens who prostituted themselves in honour of the goddess. The prostitution was strictly religious, as much so as the ceremonial cannibalism formerly prevalent among the South Sea Islanders. In return for the lives they led, the "handmaids of Istar" were independent and free from the control of men. They formed a religious community, the distinguishing feature of which was the power of indulging the passions of womanhood without the disabilities which amongst a Semitic population these would otherwise have brought. The "handmaid of Istar" owned allegiance only to the goddess she served. Her freedom was dependent on her priesthood, but in return for this freedom she had to give up all the pleasures of family life. It was a self-surrender which placed the priestess outside the restrictions of the family code, and was yet for the sake of a principle which made that family code possible. Baal, the lord of the Semitic family, claimed the firstborn as his right, and Istar or Ashtoreth similarly demanded the service of its daughters.