The Hindus believe that Kashipur, the oldest town in the Tarai region existed during the period of Ramayana and was known as Kashyap Ashram. Ujjaini Tanda, a small settlement outside the town is believed to be the site of Ujjainak Teerth, which has also been cited in the Puranas. According to a local legend, when Shravan Kumar, the dutiful son was carrying his blind parents for a pilgrimage in a basket tied to his shoulders, he stayed at Kashipur for some time.
It is said that Kashipur was also the meditation grounds of Guru Dronacharya during the period of Mahabharata. In Harsha’s rule, the city was the center of Buddhist civilization and culture. Also, the great poet and philosopher, Sant Tulsidas spent Chaturmasa (4 months of the rainy season) here, during his pilgrimage. Kashipur was also believed to be the capital of Guru Dronacharya and the birthplace of Ashvasthama, the mythological character from Mahabharata.
According to the Skand Puran, the water here at Drona Sagar as holy and sacred as the Ganga. It was considered a very sacred spot after Gangotri, Yamunotri, Badrinath and Kedarnath.