Hades

Hades (Pluto in Roman Mythology) is the Greek god of the underworld, dead, and riches. He is the eldest son of Kronos and Rhea. He is also the younger brother to Hera, Hestia, Demeter and the older brother to Zeus, and Poseidon. He is the husband of Persephone, the goddess of springtime and harvest.

Biography
Hades was born to Kronos and Rhea. Kronos had eaten his children alive and only three survived. Those three were Zeus, Poseidon and Hades. The gods had ended up victorious. The three brothers split the world into three domains. Zeus controlled the sky, Poseidon controlled the seas, and Hades controlled the underworld. They then became the big 3.

Hades then fell in love with Persephone. He had abducted her into the underworld and kept her there using a pomegranate. Demeter was angry about this so they made a deal: Persephone would spend 6 months on earth and 6 months in the underworld.