ReNuka is a King's daughter . She married Jamadagni of Bhrigu lineage and bore Him six sons of whom noteworthy are Vatsa and Lord Parasuraama aka Bhaargavaraama. Vatsa is the founder of Sri Vatsa lineage. ReNuka is a noble and chaste lady , but one day She saw a Gandharva couple and for a fraction of a second thought how beautiful the couple are . As a result of that momentary maanasic aberration She was not able to do Her regular domestic chores to a perfection. At the behest of Jamadagni , Parasuraama beheaded ReNuka , but immediately asked Jamadagn to revive ReNuka . During this process of revival Shakthi aspect of ReNuka got separated from Her ordinary aspect . Shakthi aspect became a Goddess , RENUKA DEVI and the other aspect stayed back with her husband Jamadagni. Because of his hasty decision Jamadagni lost his Thapo sakthi and ReNuka became a normal House-wife devoid of Sthree Shakthi. See what happens to even sages when they abuse their women folk Parasurama , in remorse, went away to do penance and wash away His sin. At a later date when descendants of King Kaartha VeeryaArjuna are massacring Jamadagni over a family dispute regarding Jamadagni's Holy Cow , ReNuka maatha was helpless except to call 21 times for Parasuraama to come and help and ended up committing Sathi Herself. This led Lord Parasuraama to wreak vengence on the Kings , going round Earth 21 times and killing the bad Kings starting with Kaartha VeeryaArjuna's descendants.