Once the mighty asura called Sambara once attacked Devaloka. Dasaratha called as Nemi in his early days was invited by Indra to fight against the Asura. Nemi an expert in chariot fight went along his wife Kaikeyi and fought with Sambra. Sambara assumed ten identical forms and attacked Dasaratha from ten points. In this context Nemi turned and twisted his chariot in all the ten directions at the same time and killed all the ten Sambaras and recaptured Svarga. It was from that day onwards that Nemi came to be known as Dasaratha.

In the fight with the Sambaras on all points Dasaratha's chariot was so violently shaken that the key of its axle was about to slip off and fall down. Noticing the threatened danger Kaikeyi applied her finger to the proper place of the axial and thus averted the mishap. When Dasaratha knew about this timely action of Kaikeyl he was so very pleased that he asked her to choose any two boons she desired, and she asked him to keep the boons with him to be granted whenever she requested for them.