Jamadagni

Jamadagni is remembered chiefly through his son Parashurama, whose obedience to his father's command — even to a difficult act against his own mother, Renuka — is told as an extreme test of filial duty in the Puranas.

Jamadagni's death at the hands of the Haihaya king Kartavirya Arjuna's sons is the event that sets Parashurama on his campaign against oppressive kshatriya rule, tying this sage's story directly into the Parashurama Jayanti covered in this site's festivals chapter.