Kingdom of Sardinia in the context of "War of the Fifth Coalition"

The term Kingdom of Sardinia denotes the Savoyard state from 1720 to 1861. From 1720 to 1847, only the island of Sardinia proper was part of the Kingdom of Sardinia, while the other mainland possessions (principally the Duchy of Savoy, Principality of Piedmont, County of Nice, Duchy of Genoa, and others) were held by the House of Savoy in their own right, hence forming a composite monarchy and a personal union, which was formally referred to as the "States of His Majesty the King of Sardinia". This situation was changed by the Perfect Fusion act of 1847, which created a unitary kingdom. Regardless, historians often use "Sardinia" as a synecdoche to designate the whole Savoyard state from 1720. Due to the fact that Piedmont was the seat of power and prominent part of the entity, the state is also referred to as Sardinia–Piedmont or Piedmont–Sardinia, and sometimes erroneously as the Kingdom of Piedmont.

Before becoming a possession of the House of Savoy, the medieval Kingdom of Sardinia had been part of the Crown of Aragon and then of the burgeoning Spanish Empire. With the Treaty of The Hague (1720), the island of Sardinia and its title of kingdom were ceded by the Habsburg and Bourbon claimants to the Spanish throne to the Duke of Savoy, Victor Amadeus II. The Savoyards united it with their historical possessions on the Italian peninsula, and the kingdom came to be progressively identified with the peninsular states, which included, besides Savoy and Aosta, dynastic possessions like the Principality of Piedmont and the County of Nice, over both of which the Savoyards had been exercising their control since the 13th century and 1388, respectively.

The Kingdom of Italy was proclaimed with a normative act of the Savoyard Kingdom of Sardinia — the law 17 March 1861, n. 4761 — with which Victor Emmanuel II assumed for himself and for his successors the title of King of Italy. 17 March is commemorated annually by the anniversary of the unification of Italy, a national holiday established in 1911 on the occasion of the 50th anniversary, and also celebrated, in the Republican era, in 1961 and 2011.

The Kingdom of Italy (Italian: Regno d'Italia, pronounced [ˈreɲɲo diˈtaːlja]) was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Sardinia was proclaimed King of Italy, until 10 June 1946, when the monarchy was abolished, following civil discontent that led to an institutional referendum on 2 June 1946. This resulted in a modern Italian Republic. The kingdom was established through the unification of several states over a decades-long process, called the Risorgimento. That process was influenced by the Savoy-led Kingdom of Sardinia, which was one of Italy's legal predecessor states. In 1882 it became a colonial empire, establishing the Italian Empire.

In 1866, Italy declared war on Austria in alliance with Prussia and, upon its victory, received the region of Veneto. Italian troops entered Rome in 1870, ending more than one thousand years of Papal temporal power. In the last two decades of the 19th century, Italy developed into a colonial power, and in 1882 it entered into a Triple Alliance with the German Empire and the Austro-Hungarian Empire, following strong disagreements with France about their respective colonial expansions. Although relations with Berlin became very friendly, the alliance with Vienna remained purely formal, due in part to Italy's desire to acquire Trentino and Trieste from Austria-Hungary. As a result, Italy accepted the British invitation to join the Allied Powers during World War I, as the western powers promised territorial compensation (at the expense of Austria-Hungary) for participation that was more generous than Vienna's offer in exchange for Italian neutrality. Victory in the war gave Italy a permanent seat in the Council of the League of Nations, but it did not receive all the territories it was promised.

Joseph Marie, comte de Maistre (1 April 1753 – 26 February 1821) was a Savoyard lawyer, diplomat, and political philosopher. He is chiefly remembered as one of the intellectual forefathers of modern conservatism, noted for his advocacy of social hierarchy and monarchy in the period immediately following the French Revolution. French by language and culture, Maistre was nonetheless a subject of the King of Piedmont–Sardinia, whom he served in various government positions, including stints in the Savoy Senate (1787–1792), as ambassador to the Russian Empire (1803–1817), and as minister of state to the court in Turin (1817–1821).

A key figure of the Counter-Enlightenment and a precursor of Romanticism, Maistre regarded monarchy both as a divinely sanctioned institution and as the only stable form of government. Maistre argued that the rationalist rejection of Christianity was directly responsible for the Reign of Terror and the chaos that followed the Revolution of 1789 in France. He therefore called for the restoration of the House of Bourbon to the throne of France and for the ultimate authority of the Pope in both spiritual and temporal matters.

Ferdinand II, also known as Ferdinand I, Ferdinand III, and Ferdinand V (10 March 1452 – 23 January 1516), called Ferdinand the Catholic, was King of Aragon from 1479 until his death in 1516. As the husband and co-ruler of Queen Isabella I of Castile, he was also King of Castile from 1475 to 1504 (as Ferdinand V). He reigned jointly with Isabella over a dynastically unified Spain; together they are known as the Catholic Monarchs. Ferdinand is considered the de facto first king of Spain, and was described as such during his reign, even though, legally, Castile and Aragon remained two separate kingdoms until they were formally united by the Nueva Planta decrees issued between 1707 and 1716.

The Crown of Aragon that Ferdinand inherited in 1479 included the kingdoms of Aragon, Valencia, Mallorca, Sardinia, and Sicily, as well as the Principality of Catalonia. His marriage to Isabella is regarded as the "cornerstone in the foundation of the Spanish monarchy". They played a major role in the European colonization of the Americas, sponsoring the first voyage of Christopher Columbus in 1492. That year the couple defeated Granada, the last Muslim state in Western Europe, thus completing the centuries-long Reconquista.

The Italian campaign of 1796–1797 (Italian: Campagna d'Italia), also known as the First Italian Campaign, was a series of military operations in Italy during the War of the First Coalition. Led by Napoleon Bonaparte, the First French Republic's Army of Italy fought and defeated the armies of the Kingdom of Sardinia, the Habsburg monarchy, and the Papal States, as well as various revolts, notably in the Republic of Venice.

The campaign opened with the Montenotte campaign on 10 April 1796, where despite the limitations of his means, Bonaparte descended from the Alps into Italy and achieved a rapid series of victories that decisively knocked Piedmont-Sardinia out of the First Coalition. Next, Napoleon chased the Austrian army across Lombardy, culminating in the French victory at Lodi on 10 May 1796. After putting down revolts in Pavia and Milan, the focus of Napoleon's war in Italy shifted in June 1796 to the long and difficult siege of Mantua, which would see the French blockade the city and defeat four relief efforts by Austrian armies from August 1796 to January 1797. As he besieged Mantua, Napoleon also directed the French forces in a series of invasions of the states of Central and Northern Italy, such as of Modena and Reggio, Genoa, and the Papal States. In addition to these events, Napoleon would also conclude a Franco-Sicilian-Neapolitan treaty on 10 October 1796.

The Redshirts (Italian: Camicie rosse or Giubbe rosse), also called the Red Coats, are volunteers who followed the Italian patriot Giuseppe Garibaldi during his campaigns. The name derived from the colour of their shirts or loose-fitting blouses that the volunteers, usually called Garibaldini, wore in lieu of a uniform.

The force originated as the Italian Legion supporting the Colorado Party during the Uruguayan Civil War. The story is that Garibaldi was given red shirts destined for slaughterhouse workers. Later, during the wars of Italian unification, the Redshirts won several battles against the armies of the Austrian Empire, the Kingdom of Two Sicilies and the Papal States. Most notably, Garibaldi led his Redshirts in the Expedition of the Thousand of 1860, which concluded with the annexation of Sicily, Southern Italy, Marche, and Umbria to the Kingdom of Sardinia, which led to the creation of a unified Kingdom of Italy. His military enterprises in South America and Europe made Garibaldi become known as the "Hero of the Two Worlds".

The Savoyard state comprised the states ruled by the counts and dukes of Savoy from the Middle Ages to the formation of the Kingdom of Italy. Although it was an example of composite monarchy, it is a term applied to the polity by historians and was not in contemporary use. At the end of the 17th century, its population was about 1.4 million. It was part of the Holy Roman Empire until 1797, with its territory being split between the constituent kingdoms of Burgundy (Savoy proper, Nice) and Italy (Piedmont and the rest). From 1720 it also included the island of Sardinia, which was ethnically Italian but outside of the Empire.