In the Mahabharata, Jambavantha had killed a lion, who had acquired a gem called Syamantaka from Prasena after killing him. Krishna was suspected of killing Prasena for the jewel, so He tracked Prasena’s steps until He learned that he had been killed by a lion who had been killed by a bear. Krishna tracked Jambavantha to his cave and a fight ensued. After eighteen days, realizing who Krishna was, Jambavantha submitted. He gave Krishna the gem and also presented Him his daughter Jambavati, who became one of Krishna’s wives.
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The marriage of Satyabhama and Jambavati to Krishna is closely linked to the story of Syamantaka, the precious diamond given by the Sun-god Surya to his devotee Satyajit, father of Satyabhama. Krishna requests Satyajit to present the gem to the Yadava elder Ugrasena, which the latter refuses and instead presents it to his brother Prasena. Prasena wears it on a hunting expedition, where he is killed by a lion, who is in turn killed by Jambavan, the bear-king. When accused by Satyajit of stealing the jewel, Krishna goes in its search and finally following trials of the corpses of Prasena and the lion, confronts Jambavan. After 27/28 day duel, Jambavan – the devotee of Rama surrenders to Krishna, who he realizes is none other than Vishnu. He returns the gem and gives Jambavati to Krishna. When the presumed dead Krishna returns to Dwarka, a humiliated Satyajit begs his forgiveness and offers Satyabhama’s hand in marriage along with the jewel.