In a place long ago, there were 3 brothers, all living in a peaceful world, full of nature. But, one of the brothers was not all attracted to nature, and was isolated from all of the other gods and goddess.
Zeus, God of Lightning
Poseidon, God of the Sea
Hades, God of the Underworld
Hades wasn't the Lord Of Death, but was the person to keep you after you die, sending you into a rough place as a normal person, or in a nice neighborhood if you were a hero.
He also wasn't always in the douldrums and keeping the dead, he actually liked playing, and mostly with his dog, Cerberus. It was a 3 headed dog.
He even had a house in the over world. It was still isolated, on the peak of Mount Olympus. Rarely here, but it was still a home.
He also had a home in the Underworld. But, he did not think himself as a Olympiad.