The most important of the daughters of Anu was named Istar; she was in some respects the equivalent of the classical Venus. Her worship was at first subordinate to that of Anu, and as she was goddess of love, while Anu was god of heaven, it is probable that the first intention in the mythology was only to represent love as heaven-born; but in time a more sensual view prevailed, and the worship of Istar became one of the darkest features in Babylonian mythology. As the worship of this goddess increased in favour, it gradually superseded that of Anu, until in time his temple, the house of heaven, came to be regarded as the temple of Venus. The planet Venus, as the evening star, was identified with Istar of Erech, while the morning star was Anunit, goddess of Agané. Istar, however, was worshipped under a great variety of forms. Each city, each state, had its own special Istar and its own special worship of her. In the syncretic age of Babylonian theology, these various forms and modes of worship were amalgamated together, and epithets of the goddess which were originally peculiar to particular localities, were applied to the single goddess of the state religion. Thus, according to the legends of one part of Babylonia, Istar was the daughter of the Moon-god, according to those of another part of the country she was the daughter of Anu. Hence in the mythology of a later period she appears sometimes as the daughter of the one deity, sometimes as the daughter of the other. A companion deity with Anu is Hea, who is god, of the sea and of Hades, in fact of all the lower regions. In some of his attributes he answers to the Kronos of the Greeks, in others to their Poseidon. Hea is called god of the lower region, he is lord of the sea or abyss; he is also lord of generation and of all human beings and bears the titles: lord of wisdom, of mines and treasures; of gifts, of music, of fishermen and sailors, and of Hades or hell. It has been supposed that the serpent was one of his emblems, and that he was the Oannes of Berosus; but these conjectures have not yet been proved. The wife of Hea was Davkina, the Davke of Damascius, who is the goddess of the lower regions, the consort of the deep; and their principal son was Maruduk or Merodach, the Bel of later times.