The ruling planets for Aquarius are Saturn and Uranus. Saturn was the original ruler of Aquarius, being the father of many gods in Roman mythology, and Uranus is an old Greek god, but because the planetary discovery of Uranus came after Saturn, its rule over Aquarius is fairly new.
Saturn's influence leads many Aquarians to put ideas into the world with full belief in those ideas. Uranus' influence provides a visionary spirit, which lends those under this sign a creative, inventive approach to every situation. According to some astrologers, those born under this sign have the ability to present unique ideas that will revolutionize the world. The downside to that is that the approach an Aquarian takes may be unpredictable, impersonal and seemingly cold.