Pradyumna was the son of Sri Krishna and Rukmini. His story
is mentioned in the Srimad Bhagavad Purana, Mahabharata and in many other
Puranas. As per Srimad Bhagavad Purana he was an incarnation of Kama, the Hindu
God of Love.
As per Mahabharata, he was a partial incarnation of Sanat
Kumara, the mind born son of Brahma. Thus Pradyumna is one of the deities
worshipped in the Pancharatra system.
When Kamdev was turned into ashes by the third eye of Shiva,
Rati, wife of Kamdev, was given the boon that her husband will be reborn again
in Treta Yuga and they both will reunite.
In the Treta Yuga, Rukmini wanted a child. Sri Krishna took
the blessings of Nara Narayana and went to the Himalayas
and prayed to Shiva for a child. Thus Pradyumna was born.
An Asura named Shambara was told that he will be killed by the
son of Sri Krishna and Rukmini. To avoid this prophecy, the Asura stole the six
day old Pradyumna and threw him into the ocean. The child was swallowed by a
fish.
The fish was later caught and sold to Ausra Shambara. His young
wife Mayadevi discovered the child and allowed the boy to stay in the palace.
Sage Narada then informed Mayadevi that she was a
manifestation of Rati and the child was Kamdev. When Pradyumna grew up, he fell
in love with Mayadevi.
Pradyumna then killed Shambara and married Mayadevi and
returned to Dwarka and resided with his parents.
Pradyumna died along with other Yadavas just before Sri
Krishna departed from Earth.