The silver coin 'rupia', which became the base of later Indian currency, was first issued by

Sher Shah Suri introduced a standardised silver coin called the rupia of about 178 grains, along with copper dams and gold mohurs. The Mughals continued the system. Iltutmish is remembered for the silver tanka and copper jital, and Akbar for the refined Mughal coinage after Sher Shah, not for the first rupia.