Parasurama

Once the sons of Karttavirya got to the hermitage of Jamadagni the father of Parasurama, at a time when Parasurama was away . They cut off the head of the hermit Jamadagni and took it.

When he returned his mother told him how his father was killed. She cried and beat her breast twenty-one times. Parasurama became angry and at that moment he became an avatara of revenge, and travelled over the world twenty-one times and killed every ksatriya king. The blood of all those kings flowed into one channel and gathered in a holy bath called Syaman tapan.

Visnu took his sixth manifestation as Parasurama and fulfilled his duty of destroying the wicked Ksatriya Kings (For details about Parasurama see under Parasurama and Karttaviryarjuna). (Bhagavata, Skandha 9, Chapter 16 or simply read Srimad-bhagavatam)