Kalayavana

King of the Yavanas. He could not be defeated by a Yadava . Because of him Krishna and the inhabitants of Mathura moved to Dwaraka. Kalayavana was burned to ashes by King Muchukunda.

For the story visit
http://hindumythologyforgennext.blogspot.com/2012/11/krishna-and-kalayavana-part-1-of-2.html