Spanish Real

The Spanish real was the principal silver coin and money unit of Castile and later of Spain and its empire from the fourteenth century until the nineteenth. Its eight-real multiple, the real de a ocho or "piece of eight", became the most widely traded silver coin of the early modern world and the model for the dollar and the peso.

The real ("royal") was struck in Spain and in mints across Spanish America, and its coins circulated from Europe and Africa to the Americas, India and China. Its name lives on in the rial and riyal of several modern currencies.

The real was introduced in the Crown of Castile in the fourteenth century; its first issue is traditionally credited to Peter I, who reigned from 1350 to 1369. It was a good silver coin that sat between the gold coinage and the debased small change of the period. Its value was expressed in maravedís, a unit of account that had begun as a coin but had long since become a counting unit.

In 1497 the Catholic Monarchs, Ferdinand and Isabella, reorganised the coinage with the Pragmatic of Medina del Campo. The reform fixed the silver real at 34 maravedís and created a gold coin, the excelente de Granada, of a standard close to the Venetian ducat. Multiples of the real were authorised, including pieces of two, four and eight reales. This system, with the real as the core silver unit, remained the framework of Spanish money for more than three centuries.

American silver turned the real into a global coin. The first mint in the Americas opened in Mexico City in the 1530s, and the discovery of the great silver deposits at Potosí in present-day Bolivia and at Zacatecas in Mexico produced enormous quantities of metal. Much of it was struck into eight-real coins, which were heavy, of reliable fineness and readily accepted by weight.

From 1565 the Manila galleons carried Mexican silver across the Pacific to the Philippines, where it was traded for Chinese goods. China's demand for silver drew vast numbers of pieces of eight into Asian commerce, and merchants there often stamped or tested them before acceptance. In English the coin became known as the Spanish dollar, a name borrowed from the German thaler, a large silver coin of similar size. By the eighteenth century the coin was, in practice, an international reserve currency for traders.

In the British American colonies, Spanish coins made up much of the circulating silver. When the United States established its own coinage in 1792, the new United States dollar was based on the Spanish dollar, and Spanish coins remained legal tender in the country until 1857. The American slang "two bits" for a quarter-dollar comes from the practice of counting one real as a "bit". One common explanation of the dollar sign traces it to a scribal abbreviation for pesos, although its exact origin is disputed.

After independence, Spanish American states continued to strike eight-real coins and later decimal pesos of similar weight. The Mexican peso in particular became a leading trade coin in East Asia, and silver dollars of this standard influenced the Chinese yuan, the Hong Kong dollar and the Philippine peso.

Spain's own monetary system grew complicated in the seventeenth and eighteenth centuries. Copper and billon coinage was repeatedly altered, and a distinction emerged between the real de plata (silver) and the lower-valued real de vellón (billon), which produced confusing exchange rates within the country. A series of nineteenth-century reforms simplified matters, and in 1868 Spain adopted the decimal peseta, worth four reales. The word real continued as a colloquial term for a quarter-peseta, or 25 céntimos, well into the twentieth century.

The Spanish real should not be confused with the Portuguese real, a separate unit from which the modern Brazilian real takes its name.

• American Numismatic Society
• British Museum collection
• Banco de España