Hades was the Greek God of the Underworld, the ruler of the dead. Hades Hades in Greek means the Unseen. Hades The Attributes and Symbols of Hades. Hades facts, information and stories from ancient Greek mythology. Learn about the Greek god of the dead and king of the underworld, Hades. Hades is the Greek god of the Underworld, the dead, and riches. He is the eldest son of The pitchfork is Hades ' weapon, and one of his symbols. The helmet of Symbols of Power : The Helm of Darkness.