Nag Nathaiya festival alias Nag Nathaiya Leela, held during the month of November - December at the Tulsi Ghat is a part of the Krishna Leela performance. Krishna Leela is a mythological tradition which describes the famous incident in the life of lord Krishna. The festival of Nag Nathaiya which means 'dancing on the hood of cobra' has a 400 year old tradition. The legend and the origin of Nag Nathaiya is mentioned in Mahabharata. According to that, one day whole the young Krishna was playing with his friends, he lost his ball in the river. Bal Krishna dived into the river and had a fight with Kalia, a king cobra. Identifying that, the boy is an avatar of Lord Vishnu, the snake withdrew from fight and lifted up Krishna on his hood. Krishna dances on Kalia's hood to show his superiority over the poisonous cobra.