Karuneya Niramitra; an untold story

Niramitra, Son of the most handsome Pandav Prince Nakul and Chedi Princess Karenumati. But is that all we know about him? Was he only the son of great warrior Nakul? Was he just the King of Chedi? We know the stories of all the Pandav Putras... but Niramitra's story was lost in history... so what is the untold story...