The taka, also known as the tanka or tangka, was one of the major historical currencies of Asia, particularly in the Indian subcontinent and Tibet. It was introduced in the 14th century and became a currency of the Silk Road. Its history is intertwined with the medieval Islamic history and culture of the Indian subcontinent. In modern times, the Bangladeshi taka is considered a legacy of the historical taka because Bengal was the stronghold of the currency. It was inscribed in numerous languages across different regions, including in Sanskrit, Arabic, Persian, Hindustani, Bengali, Nepali, Tibetan and Mandarin. According to The American Heritage Dictionary of the English Language and Banglapedia, the word taka came from the Sanskrit word tankah. 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. 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. The Bengal tanka was widely circulated in the Kingdom of Mrauk U (now in Myanmar) in the 16th and 17th centuries, when it was a vassal state of the Bengal Sultanate. File:Muhghazi.jpg|Silver tanka from Arakan with Perso-Arabic script The Bangladeshi taka is the currency of modern Bangladesh.