Parashurama

Parashurama is the sixth avatar of Vishnu in Hinduism. He is the son of Renuka and one of the saptarishis, Jamadagni. He lived during the last Treta and Dvapara Yugas and is one of the Chiranjivi of Hinduism. Parashurama, a Brahmin, received his famous axe after undertaking terrible penance to please Shiva, who in turn taught him Kalaripayattu .

The grandfather of Bhargava Parashurama was a great rishi named Richika who was the great grandson of a famous sage Bhrigu. Bhrigus son was Chyavana. Chyavana foresaw that a violent Brahmana would be born in his line in consequence of King Kusika and tried to curse him. However, Chyavana was so pleased with the Kings behaviour that he gave him a boon that a Brahmarshi would be born in his lineage. This resulted in the birth of Kaushika who later became known as the sage Vishwamitra. Chyavanas son was the mighty Aurva who developed intense hatred for Kshatriyas as they had put his mother in danger, when she was pregnant with him. Aurva put away his hatred and trained the Ikshwaku King Sagara in warfare. However this trait would manifest in his descendants. Aurva had a hundred sons. His eldest son, Richika, acquired the Dhanurveda and the arts of warfare spontaneously solely by fiat of his will, without any formal instruction. Richikas son, Jamadagni, also acquired the Dhanurveda in the

Source: Wikipedia