The first Accadian triad was composed of Anu, Mull-il, and Ea. Anu, or Ana, is the word for heaven, and the god is described as the "Lord of the starry heavens," and "the first-born, the oldest, the Father of the gods." It is the same idea in fact as that expressed by the Sanscrit Varuna, the Greek Ouranus. Mull-il, the next member of this triad, is the god of the abyss and nether world, while Ea is the god of the earth, seas, and rivers, "the Lord of the Deep," and personifies the wise and beneficent side of the Divine Intelligence, the maintainer of order and harmony, the friend of man. Very early with the introduction of Semitic influences Mull-il dropped out of his place in the Trinity, and was superseded by Bel, who was conceived as being the son of Ea, the personification of the active and combative energy which carries out the wise designs of Ea by reducing the chaos to order, creating the sun and heavenly bodies, and directing them in their courses, subduing evil spirits and slaying monsters. His name simply signifies "the Lord," and is applied to other inferior deities as a title of honour, as Bel-Marduk, the Lord Marduk or Merodach, the patron god of Babylon. In this capacity Bel is clearly associated with the midday sun, as the emblem of a terrible yet beneficent power, the enemy of evil spirits and dragons of darkness. The next triad is more distinctly astronomical. It consists of Uruk the moon, Ud the sun, and Mermer the god of the air, of rain and tempest. These are the old Accadian names, but they are better known by the Semitic translations of Sin, Shamash, and Raman. The next group of gods is purely astronomical, consisting of the five planets, Mars, Mercury, Jupiter, Venus, and Saturn, personified as Nergal, Nebo, Marduk, Ishtar, and Nindar. The number of gods was further increased by introducing the primary polarity of sex, and assigning a wife to each male deity. Thus Belit, or "the Lady," was the wife of Bel, he representing the masculine element of Nature, strength and courage; she the feminine principle of tenderness and maternity. So also Nana the earth was the wife of Anu, the god of the strong heavens; Annunit the moon the wife of Shamash the sun; and Ishtar (Astarte, Astoreth, or Aphrodite), the planet Venus, the Goddess of Love and Beauty, though a great goddess in her own right, was fabled to have had Tammuz or Thammuz, one of the names of the sun, as a husband, whence in later times came the myth of Nature mourning for the sun-god, slain by the envious boar, winter.