Kingdom of Sardinia (1324–1720) in the context of "Savoy dynasty"

Charles V (24 February 1500 – 21 September 1558) was Holy Roman Emperor and Archduke of Austria from 1519 to 1556, King of Spain (as Charles I) from 1516 to 1556, King of Sicily and Naples from 1516 to 1554, and also Lord of the Netherlands and titular Duke of Burgundy (as Charles II) from 1506 to 1555. He was heir to and then head of the rising House of Habsburg. His dominions in Europe included the Holy Roman Empire, extending from Germany to northern Italy with rule over the Austrian hereditary lands and Burgundian Low Countries, and Spain with its possessions of the southern Italian kingdoms of Sicily, Naples, and Sardinia. In the Americas, he oversaw the continuation of Spanish colonization and a short-lived German colonization. The personal union of the European and American territories he ruled was the first collection of realms labelled "the empire on which the sun never sets".

Charles was born in Flanders to Habsburg Archduke Philip the Handsome, son of Maximilian I, Holy Roman Emperor and Mary of Burgundy, and Joanna of Castile, younger child of Isabella I of Castile and Ferdinand II of Aragon, the Catholic Monarchs of Spain. Heir of his grandparents, Charles inherited his family dominions at a young age. After his father's death in 1506, he inherited the Habsburg Netherlands in the Low Countries. In 1516 he became King of Spain as co-monarch of Castile and Aragon with his mother. Spain's possessions included the Castilian colonies of the West Indies and the Spanish Main, as well as Naples, Sicily, and Sardinia. At the death of his grandfather Maximilian in 1519, he inherited the Austrian hereditary lands and was elected as Holy Roman Emperor. He adopted the Imperial name of Charles V as his main title, and styled himself as a new Charlemagne.

The House of Savoy (Italian: Casa Savoia, French: Maison de Savoie) is a royal house (formally a dynasty) of Franco-Italian origin that was established in 1003 in the historical region of Savoy, which was originally part of the Kingdom of Burgundy and now lies mostly within southeastern France. Through gradual expansions, the family grew in power, first ruling the County of Savoy, a small Alpine county northwest of Italy, and later gaining absolute rule of the Kingdom of Sicily. During the years 1713 to 1720, they were handed the Kingdom of Sardinia and would exercise direct rule from then onward as Piedmont–Sardinia, which was the legal predecessor state of the Kingdom of Italy and the Italian Empire, which in turn are the predecessors of the present-day Italian Republic.

From rule of a region on the French–Italian border, by the time of the abolition of monarchy in Italy, the dynasty's realm grew to include nearly all of the Italian peninsula. Through its junior branch of Savoy-Carignano, the House of Savoy led the Italian unification in 1861, and ruled the Kingdom of Italy until 1946. They also briefly ruled the Kingdom of Spain during the 19th century. The Savoyard kings of Italy were Victor Emmanuel II, Umberto I, Victor Emmanuel III, and Umberto II. Umberto II reigned for only a few weeks, as the last king of Italy, before being deposed following the 1946 Italian institutional referendum, after which the Italian Republic was proclaimed.

The Hispanic Monarchy (Monarquía Hispánica in Spanish), also known as the Catholic Monarchy and historically referred to as the Monarchy of Spain, was the political entity encompassing the territories and dependencies of the Spanish Empire between 1479 and 1716. These regions maintained distinct, individual public institutions, councils, and legal systems, but were united under the control of a superior entity (the King of Spain) and common state institutional structures. This monarchy was administered under a polysynodial system of councils. The Spanish monarch acted as king (or with the corresponding title) according to the political constitution of each kingdom, state, or lordship, and thus, their formal power varied from one territory to another. However, they acted as a unified monarch over all the territories of the monarchy, almost like a Composite Monarchy.

The Monarchy included the Crown of Castile—with Granada, Navarre and the kingdoms of the Indies—and Aragon—with Sicily, Naples, Sardinia, Malta and the State of the Presidi—, Portugal and its overseas territories between 1580 and 1640, the territories of the Burgundian Circle except between 1598–1621—Franche-Comté, the Netherlands, as well as Charolais—, the Duchy of Milan, the Marquisate of Finale, the Spanish East Indies, and Spanish Africa.