Sage Jamadagni

 
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Sage  Jamadagni was a Rig Vedic Sage and a descendant of Sage Bhrigu. His wife was Renuka. Parashurama was his son.

 References:

Once he suspected his wife Renuka and ordered his sons to kill her. None of the sons ventured but the last son Parasurama came forward, beheaded her, and beheaded all his brothers. Pleased with this act, Sage Jamadagni offered to grant  a boon to Parasuram.  Parasurama asked his father that his mother and brothers be restored to life. 

 

Sage Jamadagni was killed by king KarthaVeeryarjun as he refused to surrender the divine cow, Kamadhenu to the king.