- Kalayavana Surrounds Mathura, Page from a Dispersed Bhagavata Purana Series (from collection of Brooklyn Museum, New York City)
That detail was found on the book "Worshiping Siva and Buddha: The Temple Art of East Java"
By Ann R. Kinney, Marijke J. Klokke, Lydia Kieven.
Here the authors captioned the relief as "The spoils of victory, female captives from Yawana", Krishnayana relief, Candi Panataran, Biltar District, East Java.
And the relief location as "Second register, north side, Main Temple, third courtyard".
This is from the book:
"The Krishna story at Panataran begins in a recess to the left corner stairs where the demon king plans to attack Krishna ... In the panel to the left of the stairs, the king of Yawana at the head of his demon army is chasing Krishna ....
Turning to the corner to the north side, the story continues with a scene showing men fleeing Yawana with their possessions being accosted by Krishna's forces, followed by a depiction of female captives being presented to two men on horseback"
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The front horseman in the relief is Shree Krishna himself and the second horseman is Krishna's elder brother Balarama.
There are two reasons for deciding this.
Firstly, the authors also observed that in reliefs where Shree Krishna is present he is accompanied by two servants carrying a betel box and a spittoon, and usually by two brahmins as well.
Now looking at our image we can identify two servatnts and a brahmin easily.
Secondly, this story is actually a very interesting episode from "Vishnu Purana" and "Harivamsa" of Hindu Mythology.
There it is known as "Krishna and Kalayavana" episode. And we know from it that Shree Krishna and Balarama, two brothers destroyed the invading Yavana* (Greek) army together at the end.
* Yavana is a term used from the Vedic times to denote Greeks, or people from the middle east.
"The king of Yawana" referred in the book above is actually Kalayavana of Hindu mythology. According to the Vishnu Purana and Harivamsa, Kālayavana (black Greek/Yona) was a Yavana king. This legend appears to indicate a Greek invasion from across the Himalayas.
Kalayavana was undefeated and unmatched in battle due to a boon. When he learned that Shree Krishna is the only person who can defeat him in battle, accepting this challenge he set out to invade Shree Krishna's kingdom, Mathura with an army of three million yavanas.
Kalayavana realizing that the yavanas have greatly outnumbered all the yadavas, decided to challenge Shree Krishna for a duel. Shree Krishna strategically fled the battlefield and lured Kalayavana into the cave where the great king of Treta yuga, Muchukunda (one of the forefathers of Lord Shree Rama) was in a deep slumber of thousands of years after helping devas (Gods) in an epic war with asuras (Demons).
Contemplating an absolutely undisturbed sleep he was given a boon by Lord Indra that anyone who dared to disturb his sleep would get burnt to ashes immediately. Fast forward to Dwapara yuga timeline, in the darkness deep inside the cave, Shree Krishna covered Muchukunda with his shawl. Kalayavan assuming him to be Shree kicked him and abused him as ranchhod.
With continuously three, four hits, Muchukund woke up and opened his eyes. He found someone before his eyes and the person in front of him started flashing and fired automatically. Kalyavana caught fire and burned to ashes in no time.
When finally the king was killed, the yavana army could not meet the challenge when Balarama attacked them. Shree joined Balarama and together the two brothers destroyed the army.
The interesting stories related to this episode can be read here:
Krishna and Kalayavana - Part 1 of 2
Krishna and Kalayavana - Part 2 of 2
For anyone who is interested to know:
The next reliefs in this series at Penataran temple depicts the events of "Shree Krishna’s abduction of his future wife Rukmini and the union of Krishna and Rukmini"