Dobla

[1] In general, a dobla was a valuable gold coin, while the maravedi was de-valued into silver (c. 1258) or rarely copper forms.

The sister of Henry I of Castile, Berenguela, and his nephew Ferdinand III, had made a new coin, also called "maravedi" which was equivalent to the Muslim half-dinar.

Ferdinand II's gold maravedí weighed about 3.8 g. Alfonso's son, Henry I of Castile, continued to mint gold maravedís during his short reign, but his sister Berenguela and nephew Ferdinand III made a coin which was equivalent to the Muslim half-dinar, or masmudina.

The Muslim rulers in North Africa and Granada meanwhile continued to mint masmudinas up to the reign of Ferdinand and Isabella.

In Castile, the maravedí de oro soon became the accounting unit for gold, alongside the sueldo (from solidus) for silver and the dinero (from denarius) for billon (vellón in Spanish).

The gold content of the maravedí fell to a gram during the reign of James I of Aragon (1213–1276), and it kept falling, eventually becoming a silver coin c.1258 under Alfonso X of Castile (1252–1284).

The 15th century was one of extreme monetary confusion in Castile, reaching a peak under Henry IV (1454–1474), who began a simplified standard for currencies.

In their pragmatic, issued at Segovia on 20 February 1475, they adopted Henry's coinage and set values for the doblas and reales in terms of the maravedí, which by the 15th century had degenerated into a vellón currency.

[1] The monetary system was finally reformed and stabilized under Ferdinand and Isabella, when they issued the Ordinance of Medina del Campo, June 2, 1497.

The reform was completed by Charles I when he replaced the ducado (equivalent of the Venetian ducat) with the escudo as the standard gold coin in 1537.

This reduction was on account of the cost and risk of their transportation from Spain, before the establishment of the first mint houses of Mexico and Santo Domingo.

Initially produced in Spain specially for the Indies, they were later struck locally at Hispaniola years before the mints of Mexico and Santo Domingo were officially established.