Asamanja or Asamanjan was Son of Sagara and Kesini.

Sagara had 60,000 sons from wife Sumati and one son from Kesini. He was a wild and wicked young man, and was abandoned by his father. But his son Anshuman succeeded Sagara as king. According to another version he was a great Yogin and acted like a wicked man to be thrown out of the kingdom, so that he could quit the worldly life to pursue spiritual goals.

According to the IIari-vansa, he was afterwards famous for valour under the name of Panchajana.