Lal Kot is ranks among the most ancient monuments of Delhi as it dates back to the eighth century. The monument owes its origin to Anangpal Tomar who had built it as a majestic red fortress as he shifted his capital to the city. Gigantic walls were later added by the Rajputs who captured the fort in the 12th century. The fort was however robbed of its glory as the Slave rulers reduced the fortifications to ruins and in an attempt to wipe out the Hindu reign, replaced the fort with a mosque which also happens to be the first mosque in India.