According to Hindu legends, Jamadagni (or Jamdagni , Sanskrit: जमदग्नि महार; Pali: Yamataggi) is one of the Saptarishi (Seven Great Sages Rishi) in the seventh, current Manvantara.
He is the father of Parashurama, the sixth incarnation of Vishnu. He was a descendant of the sage Bhrigu, one of the Prajapatis created by Brahma, the God of Creation. Jamadagni had five children with wife Renuka, the youngest of whom was Parashurama, an avatar of Lord Vishnu.
Jamadagni was well versed in the scriptures and weaponry without formal instruction. Lineage: Even today it is believed that we have descendants from Jamadagni’s family tree. In fact other than being one of the saptharshis, Jamadagnis name is still in vogue with some families, particularly around south India carry Jamadagni Gotra. Originally, it is briefed (source: Bhaagavatha purana) that Sage Bhrigu is the earliest predecessor to Jamadagni’s family tree.
Bhrigu → Chyavana → Aaplavana → Aurava → Ruchika (Jamadagni’s father)