Nanda and Sunanda
During the period of Chand Kings, Nanda Devi worship took the shape of a Fair. Prior to this Nanda Devi was being worshipped, but at that time only an idol of Nanda Devi used to be worshipped. The custom to make two idols started from the period of Baj Bahadur Chand. Even today only one idol is prepared in the remote villages. The reason for this addition appears to because it appears that the goddesses Nanda and Sunanda together took birth as princesses in the royal family and to mark this new reincarnation, the practice of celebrating a festival for both sisters together was introduced in which a story of from their life is enacted. There is folk lore that while walking in the forest a bull chased them. They hid themselves behind a banana tree. A goat came there and ate away the banana leaves with the result Nanda and Sunanda were visible to the bull, which killed both the sisters. This is the reason that goat and bull are sacrificed during the celebrations.
The twin peaks of the Nanda Devi and Sunanda Devi Mountain are said to be the abode or represent the two goddesses. These graceful peaks are visible from most of Kumaon division of Uttarakhand province of India.
Read more about this topic: Nanda Devi Raj Jat