Trienio Liberal in the context of "Province (Spain)"

A province in Spain is a territorial division defined as a collection of municipalities. The current provinces of Spain correspond by and large to the provinces created under the purview of the 1833 territorial re-organization of Spain, with a similar predecessor from 1822 (during the Trienio Liberal) and an earlier precedent in the 1810 Napoleonic division of Spain into 84 prefectures. There are many other groupings of municipalities that comprise the local government of Spain.

The boundaries of provinces can only be altered by the Spanish Parliament, giving rise to the common view that the 17 autonomous communities are subdivided into 50 provinces. In reality, the system is not hierarchical but defined according to jurisdiction (Spanish: competencias).

Spain in the 19th century was a country in turmoil. Occupied by Napoleon from 1808 to 1814, a massively destructive "liberation war" ensued. Following the Spanish Constitution of 1812, Spain was divided between the constitution's liberal principles and the absolutism personified by the rule of Ferdinand VII, who repealed the 1812 Constitution for the first time in 1814, only to be forced to swear over the constitution again in 1820 after a liberal pronunciamiento, giving way to the brief Trienio Liberal (1820–1823). This brief period came to an abrupt end with Ferdinand again abolishing the 1812 constitution and the start of the Ominous Decade (1823–1833) of absolutist rule for the last ten years of his reign.

Economic transformations throughout the century included the privatisation of communal municipal lands—not interrupted but actually intensified and legitimised during the Fernandine absolutist restorations —as well as the confiscation of Church properties. The early century saw the loss of the bulk of the Spanish colonies in the New World in the 1810s and 1820s, except for Cuba and Puerto Rico.

Ferdinand VII (Spanish: Fernando VII; 14 October 1784 – 29 September 1833) was King of Spain during the early 19th century. He reigned briefly in 1808 and then again from 1813 to his death in 1833. Before 1813, he was known as el Deseado (the Desired), and after, as el Rey Felón (the Criminal King).

Born in Madrid at El Escorial, Ferdinand was heir apparent to the Spanish throne in his youth. Following the 1808 Tumult of Aranjuez, he ascended the throne. That year Napoleon overthrew him; he linked his monarchy to counter-revolution and reactionary policies that produced a deep rift in Spain between his forces on the right and liberals on the left. Back in power in December 1813, he re-established the absolutist monarchy and rejected the liberal constitution of 1812. A revolt in 1820 led by Rafael del Riego forced him to restore the constitution, starting the Liberal Triennium, a three-year period of liberal rule. In 1823, the Congress of Verona authorised a successful French intervention, restoring him to absolute power for the second time. He suppressed the liberal press from 1814 to 1833, jailing many of its editors and writers.

The 1822 territorial division of Spain was a rearrangement of the territory of Spain into various provinces, enacted briefly during the Trienio Liberal of 1820–1823. It is remembered today largely as a precursor to the similar 1833 territorial division of Spain; the provinces established in the latter remain, by and large, the basis for the present-day division of Spain into provinces.

The Age of Revolution is a period from the late-18th to the mid-19th centuries during which a number of significant revolutionary movements occurred in most of Europe and the Americas. The period is noted for the change from absolutist monarchies to representative governments with a written constitution, and the creation of nation states.

Influenced by the new ideas of the Enlightenment, the American Revolution (1765–1783) is usually considered the starting point of the Age of Revolution. Later revolution would be the French Revolution of 1789, the revolution that rapidly spread to the rest of Europe through its wars. In 1799, Napoleon took power in France and continued the French Revolutionary Wars by conquering most of continental Europe. Although Napoleon imposed on his conquests several modern concepts such as equality before the law, or a civil code, his rigorous military occupation triggered national rebellions, notably in Spain and Germany. After Napoleon's defeat, European great powers forged the Holy Alliance at the Congress of Vienna in 1814–15, in an attempt to prevent future revolutions, and also restored the previous monarchies. Nevertheless, Spain was considerably weakened by the Napoleonic Wars and could not control its American colonies, almost all of which proclaimed their independence between 1810 and 1820. Revolution then spread back to southern Europe in 1820, with uprisings in Portugal, Spain, Italy, and Greece. Continental Europe was shaken by two similar revolutionary waves in 1830 and 1848, also called the Spring of Nations. The democratic demands of the revolutionaries often merged with independence or national unification movements, such as in Italy, Germany, Poland, Hungary, etc. The violent repression of the Spring of Nations marked the end of the era.

Captain-General Rafael del Riego y Flórez (7 April 1784 – 7 November 1823) was a Spanish Army officer and politician who played a key role in the establishment of the Liberal Triennium (Trienio liberal in Spanish). The failure of the Cádiz army to set sail has been identified as the most important factor in the loss of Spanish control over the Río de la Plata.