As per the history of Kullu District, references of its origin could be traced back Ramayana and Mahabharata . The valley has witnessed a number of events and incidents believed to be associated with it during Ramayana and Mahabharata period. It is said that Pandavas it is said, visited this valley several times. According to one legend, Arjuna , under the advice of Rishi Vyas, practiced austerities in a cave called `Arjun Gupha` in the mountain of Inderkila (now called Deo Tiba) in order to get the powerful Pasupata Astra from Indra. Vyas Rishi performed his `tapa` in this valley during that period, at a place called `Vyas Kund` on Rohtang Pass. It was because of this that the river Vipasha got the present name of Beas River . History of Kullu District also suggests the origin of its name. It says that Kullu derives its name from `Kalut` which was a tribe in the upper valley of River Beas, as mentioned by Barahmir in Barihat Sahinta. There are other evidences in history