Savoyard state in the context of "Kingdom of Italy (Holy Roman Empire)"

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 Duchy of Savoy was a territorial entity of the Savoyard state that existed from 1416 until 1847 and was a possession of the House of Savoy.It was created when Sigismund, Holy Roman Emperor, raised the County of Savoy into a duchy for Amadeus VIII. The duchy was an Imperial fief, subject of the Holy Roman Empire, until 1792, with a vote in the Imperial Diet. From the 16th century, Savoy belonged to the Upper Rhenish Circle.

Its territory included the current French departments of Savoie, Haute-Savoie, and the Alpes-Maritimes, the current Italian region of Aosta Valley, a large part of Piedmont and the County of Geneva in Switzerland, which was then lost to the Old Swiss Confederacy. The main Vulgar languages that were spoken within the Duchy of Savoy were Arpitan and Piedmontese.

Charles VI (German: Karl; Latin: Carolus; 1 October 1685 – 20 October 1740) was Holy Roman Emperor and ruler of the Austrian Habsburg monarchy from 1711 until his death, succeeding his elder brother, Joseph I. He unsuccessfully claimed the throne of Spain following the death of his relative, Charles II. In 1708, he married Elisabeth Christine of Brunswick-Wolfenbüttel, by whom he had his four children: Leopold Johann (who died in infancy), Maria Theresa, Maria Anna (Governess of the Austrian Netherlands), and Maria Amalia (who also died in infancy).

Four years before the birth of Maria Theresa, faced with his lack of male heirs, Charles provided for a male-line succession failure with the Pragmatic Sanction of 1713. The Emperor favoured his own daughters over those of his elder brother and predecessor, Joseph I, in the succession, ignoring the Mutual Pact of Succession he had signed during the reign of his father, Leopold I. Charles sought the other European powers' approval. They demanded significant terms, among which were that Austria close the Ostend Company. In total, the states of Great Britain, France, Saxony-Poland, the Dutch Republic, Spain, Venice, the Papal States, Prussia, Russia, Denmark, Savoy-Sardinia, and Bavaria, plus the Diet of the Holy Roman Empire, recognised the sanction. France, Spain, Saxony-Poland, Bavaria, and Prussia later reneged. Charles died in 1740, sparking the War of the Austrian Succession, which plagued his successor, Maria Theresa, for eight years.

The County of Nice (French: Comté de Nice / Pays Niçois; Italian: Contea di Nizza / Paese Nizzardo; Niçard Occitan: Contèa de Niça / País Niçard) was a historical region of France and Italy located around the southeastern city of Nice and roughly equivalent to the modern arrondissement of Nice. It was part of the Savoyard state within the Holy Roman Empire.

The Kingdom of Sardinia, also referred to as the Kingdom of Sardinia and Corsica among other names, was a kingdom in Southern Europe from the late 13th until the mid-19th century. The kingdom's history can be divided into two distinct phases, one as part of the Aragonese and Spanish crowns (1324-1720) and one as a possession of the Savoyard state (1720-1861).

The kingdom was a member of the Council of Aragon and initially consisted of the islands of Corsica and Sardinia, sovereignty over both of which was claimed by the papacy, which granted them as a fief, the Regnum Sardiniae et Corsicae (Kingdom of Sardinia and Corsica), to King James II of Aragon in 1297. Beginning in 1324, James and his successors conquered the island of Sardinia and established de facto their de jure authority. In 1420, after the Sardinian–Aragonese war, the last competing claim to the island was bought out. After the union of the crowns of Aragon and Castile, Sardinia became a part of the burgeoning Spanish Empire.

The titles of the count of Savoy, and then duke of Savoy, are titles of nobility attached to the historical territory of Savoy. Since its creation, in the 11th century, the House of Savoy held the county, the ruler of which was originally styled "count," then later as "duke"; several of these rulers were called "king" at one point in history or another.

The County of Savoy was elevated to a duchy at the beginning of the 15th century, bringing together all the territories of the Savoyard state under Amadeus VIII, Duke of Savoy. In the 18th century, Victor Amadeus II annexed the Kingdom of Sardinia to the historical possessions of the Duchy, and from then on, the Savoyard dukes also held the title of Kings of Sardinia. The House of Savoy later went on to rule the Kingdom of Italy from 1861 to 1946 when the monarchy was abolished.

Victor Amadeus II (Italian: Vittorio Amedeo Francesco, Arpitan: Victor-Amèdê, French: Victor-Amédée; 14 May 1666 – 31 October 1732) was the head of the House of Savoy and ruler of the Savoyard states from 12 June 1675 until his abdication in 1730. He was the first of his house to acquire a royal crown, ruling first as King of Sicily (1713–1720) and then as King of Sardinia (1720–1730). Among his other titles were Duke of Savoy, Duke of Montferrat, Prince of Piedmont, Marquis of Saluzzo and Duke of Aosta, Maurienne and Nice.

Louis XIV arranged his marriage in order to maintain French influence in Savoy, but Victor Amadeus soon broke away from the influence of France. At his father's death in 1675, his mother, Marie Jeanne Baptiste of Nemours, was regent in the name of her nine-year-old son and would remain in de facto power until 1684 when Victor Amadeus banished her further involvement in the state. Having fought in the War of the Spanish Succession, he was rewarded with the Kingdom of Sicily in 1713, but he was forced to exchange this title for the poorer Kingdom of Sardinia in 1720.

The County of Savoy was a feudal state of the Holy Roman Empire which emerged, along with the free communes of Switzerland, from the collapse of the Burgundian Kingdom in the 11th century. It was the cradle of the future Savoyard state.