Lucknow: The Last Phase of an Oriental Culture - pg. 36

It is said that after Raja Ramchandra had conquered Ceylon and completed his term of exile in the wilderness, and when he had honoured the status of kingship by adopting its form, he gave this region as a reward to his devoted brother Lachman [Lakshman], who had accompanied him on his travels/ To commemorate the latter's stay, a village was built on a high hill overlooking the river which since that day has been known as Lachmanpur. The hill was called Lachman Hill and in it was a very deep cave with a well of which no one could estimate the depth. People said it went down as far as Shesh Nag. This idea gave impetus to religious feeling and Hindus, inspired by faith, would go there to sprinkle water and offer flowers.