Agrasen ki Baoli (also known as Agar Sain ki Baoli or Ugrasen ki Baoli), is a 60-meter long and 15-meter wide historical step well on Hailey Road near Connaught Place, Delhi. Although there are no known historical records to prove who built Agrasen ki Baoli, it is believed that it was originally built by the legendary King Agrasen during the Mahabharat epic era.
In 1132 AD an Agrawal poet named Vibudh Shridhar mentions, in his work Pasanahacariu. A wealthy and influential Agrawal merchant of Dhilli named Nattal Sahu was also a minister in the court of King Anang Pal III so it is possible that Baoli was built/repaired in that era since Agrawal community traces its origin to Maharaja Agrasen.
The Mosque right next to the Baoli can be assumed to be built at much later stage.