This is an old watercolour painting of old fort in Delhi by Mohammad Akbar Ali Khan.
It is interesting to note that he calls it by name ‘Indrapat or Qila e Kuhna’. Even more interesting part is that he calls it being built by Raja Anangpal in 429 Vikrami Samvat( c. 372CE). I wonder from where he obtained this information! Was it some tradition or old Moghul records in his knowledge?