Iitutmish , the Sultan of Delhi, was contemporary of Mongol leader Chengiz Khan. In 1221 A.D., there was a danger of expected attack of Chengiz khan on Delhi.
The land revenue system adopted by Akbar was largely based on Sher Shah’s system. However Akbar introduced slight modifications and his system was called Zabti or Bandobast system, which was further improved by Raja Todar Mal.