The Spanish peso was the currency used in Spain from the late 15th century until the 19th century. It was a silver coin that became widely accepted in international trade, influencing the development of other currencies. The peso was divided into smaller units called reales. In 1868, the Spanish peseta replaced the peso as the official currency of Spain. The peseta continued to be used until Spain adopted the euro in 2002. The historical significance of the Spanish peso is evident in its impact on global trade and the evolution of modern currencies.