Hades
Hades, son of Cronus and Rhea, received the Underworld when his brothers, Zeus and Poseidon, received dominion of the sky and sea.
The Cyclops gave Hades the helmet of invisibility to help in the gods' battle with the Titans. Thus, his name means "The Invisible."The realm he rules over is also called Hades.
Hades is the enemy of all life, gods, and men. Since nothing will sway him, he is rarely worshiped.
Sometimes a milder form of Hades, Pluto, is worshiped as the god of wealth since the wealth of the earth comes from what lies below.
His attributes include his dog Cerberus, the key to the Underworld, and sometimes a cornucopia or a two-pronged pick-axe. The cypress and narcissus are plants sacred to him. Sometimes black sheep were offered to him in sacrifice.
Source: Oskar Seyffert's Dictionary of Classical Antiquities
