Hades

In "Soul of the Bride" Piper explains that Hades is the God of the Underworld, but not by choice! He had two brothers -- Zeus and Poseidon. When They came to power, they drew lots to see how to divide the world. Zeus won the draw and got the best position -- king of the Gods and ruler of the Heavens. Next in line was Poseidon, who became Lord of the Sea. Last and least was Hades, who became King of the Underworld, which also came to be called Hades.

Eventually, he kidnapped a young Goddess, Persephone, to be his wife. She would have been able to escape his clutches, but because she'd eaten six pemogranate seed once she was in the Underworld she was doomed to spend half each year down under. The rest of the time, she could come back to Earth to be with her mother.

In "Soul of the Bride" Hades also had a son Nikos who tricked Phoebe into being his love and forced her to stay in his Underworld castle with him.