Ottoman kurus

The Ottoman kuruş, widely referred to in European languages as the piastre, was introduced in 1688 as a major coin of the Ottoman monetary system. Subdivided into 40 para or 120 akçe, it served as the empire's principal unit of account and currency standard until the monetary reforms of the mid-nineteenth century. Its denomination name derived from the French gros and Latin grossus, reflecting linguistic and commercial ties to heavy European silver coinage.

Originally struck as a large silver piece comparable in scale to European thalers, the French écu, and the Spanish dollar, the kuruş underwent sustained debasement over its lifespan. By the late eighteenth and early nineteenth centuries, severe reductions in fineness had transformed it into a billon coin weighing less than three grams. To accommodate fluctuating silver values, authorities issued various multiples and fractions during the early nineteenth century, including pieces of 1, 1½, 2, 2½, 3, 5, and 6 kuruş, alongside billon and silver para coinages.

A major monetary restructuring occurred in 1844 with the introduction of the Ottoman gold lira. Under this reformed system, the kuruş ceased to be the primary standard and was redefined as a silver subunit equal to one hundredth of a lira. Ottoman kuruş coinage traditionally featured the imperial tughra of the reigning sultan. The denomination endured through the twilight of the Ottoman Empire, continuing to circulate into the twentieth century and surviving within the monetary systems of several successor states, including Turkey, Egypt, and Syria.