The son of Jamadagni was Rāma, or Paraśurāma

The son of Jamadagni was Rāma, or Paraśurāma. When a king named Kārtavīryārjuna stole Jamadagni’s desire cow, Paraśurāma, who is ascertained by learned experts to be a saktyāveśa incarnation of the Supreme Personality of Godhead, killed Kārtavīryārjuna. Later, he annihilated the kṣatriya dynasty twenty-one times. After Paraśurāma killed Kārtavīryārjuna, Jamadagni told him that killing a king is sinful and that as a brāhmaṇa he should have tolerated the offense. Therefore Jamadagni advised Paraśurāma to atone for his sin by traveling to various holy places.