Ikshwaku’s eldest son Vikukshi had a son named Puranjay. Towards the end of Satyuga, Indra came to him seeking his help in the ongoing Devasura Samgram. Puranjay agreed to help Indra only if he agrees to become his ride.
Indra transformed himself into a giant bull. Purajnay fought in the battle against the demons riding that bull. He won the battle and returned the kingdom of heaven to Indra.
He was also known as Indravaha for he rode Indra. For riding the bull in the battle his another name became Kukutstha.
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