Indra

Indra, 4-5th c. AD (Mathura, India)
In the earliest Hindu stories that we know of, from the Rig Veda, Indra is the ruler of the Hindu gods, the way Zeus is the ruler of the Greek gods, or Thor the ruler of the German gods. These stories probably go back at least to about 1000 BC. In the Rig Veda, Indra is the son of Dyeus Pita, the Indo-European god from whom the Greeks got Zeus, the Romans got Jupiter, and the Germans got Tyr. Indra may be the same god as the Greek god Dionysos, also a son of Zeus, though Dionysos is not a storm god. Indo-European gods often overthrow their fathers, as Zeus overthrew Kronos, and apparently in India Indra killed Dyeus Pita and took his powers.
Indra was the god of rain, and also the god of war. For people who get most of their food from farming, it's very important to control the rain so it falls just at the right time for your crop.
Indra's main weapon was the thunderbolt. He rode a white elephant called Airavata. Sometimes carvings of Indra show him with four arms. Indra lived in the clouds near the top of a tall mountain. After they died, warriors could go up to Indra's house, where they lived forever, playing games and watching dancers perform. People worshipped Indra by sacrificing animals to him.
But by around 300 BC, people in India didn't like to sacrifice animals any more, and they gradually stopped worshipping Indra so much. Instead, they began to worship the new gods Shiva and Vishnu, who didn't need animal sacrifices. But people still thought of Indra as a god, and told stories about him and how he lost his power.

