Fiat money is a type of currency that is not backed by a precious metal, such as gold or silver. It is typically designated by the issuing government to be legal tender, and is authorized by government regulation. Since the end of the Bretton Woods system in 1971, the major currencies in the world are fiat money.
Yuan dynasty banknotes are a medieval form of fiat money.
Song Dynasty Jiaozi, the world's earliest paper money.
Kublai Khan, also known by his temple name as the Emperor Shizu of Yuan and his regnal name Setsen Khan, was the founder and first emperor of the Mongol-led Yuan dynasty of China. He proclaimed the dynastic name "Great Yuan" in 1271, and ruled Yuan China until his death in 1294.
Portrait of young Kublai by Araniko, a Nepali artist in Kublai's court
Kublai Khan was chosen by his many supporters to become the next Great Khan at the Grand Kurultai in the year 1260. Kublai Khan and His Empress Enthroned, from a Jami al-Twarikh (or Chingiznama). Mughal dynasty, Reign of Akbar, 1596. Mughal Court. Opaque watercolor, ink, and gold on paper. India. Freer Gallery of Art. F1954.31 [1]
Kublai Khan in the Catalan Atlas (1375). The caption reads: "The most powerful prince of the Tartars is named Holubeim [Kubilay Khan], that means Great Khan. This emperor is richer than any other emperor in the world. This emperor is protected by twelve thousand horsemen with their four captains that stay at the court three months of the year."