Medieval Bihar saw a period of glory lasting about six years during the rule of Sher Shah Suri, who hailed from Sasaram. Sher Shah Suri built the longest road of the Indian subcontinent, the Grand Trunk Road, which started at Calcutta (Bengal) and ended at Peshawar, now Pakistan. The economic reforms carried out by Sher Shah, such as the introduction of the Rupee and Custom Duties, are still used in the Republic of India. He revived the city of Patna, where he built his headquarters.