the silver coin used as currency during delhi sultanate
History of the taka The imperial tanka (also called Sultani Tanka) was officially introduced by the monetary reforms of Muhammad bin Tughluq, the emperor of the Delhi Sultanate, in 1329. It was modeled as representative money, a concept pioneered as paper money by the Mongols in China and Persia. The tanka was minted in copper and brass. Its value was exchanged with gold and silver reserves in the imperial treasury. The currency was introduced due to the shortage of metals.[1] Over time, the tanka was minted in silver. However, chaos followed its launch in the 14th century, leading to the collapse of the Tughluq dynasty. The Tughluqs were succeeded by numerous regional states, notably the Bengal Sultanate, the Bahmani Sultanate and the Gujarat Sultanate. These kingdoms continued to mint the new currency in the name of their own rulers. Even much later under the early modern Mughal Empire, regional currencies were still referred to as tanka/tangka/taka.