
Flag of the Kingdom of Sardinia from 1848 to 1861, with the Savoy coat of arms within the Italian 'tricolore'.
History
Sardinia before the Savoyard dynasty (1324-1720)
Pope Boniface VIII awarded Sardinia to the Spanish Kings of Aragon in 1297, but it took until 1324 before they could claim control of the island. Through this line the Kingdom of Sardinia became part of the Spanish Empire from 1516 to 1700. Sardinia was one of the focus points of the War of the Spanish Succession (1700-1714). Initially ruled by the Spanish King Philip V, Sardinia was taken by Habsburg Austrian forces in 1708 with support of a British fleet. From 1717 until 1720 it was briefly Spanish again.

The Aragonese Empire in the 15th century included Sardinia and Corsica.
During the War of the Spanish Succession, the Dukes of Savoy had switched sides to Habsburg Austria and were awarded Spanish territories in northern Italy and Sicily. In 1720 the title King of Sardinia was given to them in exchange for Sicily. This created the situation of a kingdom named after an island but ruled from mainland territory by a dynasty from the mainland.

Flag of Sardinia
The Duchy of Savoy before 1720
The County of Savoy was formed in 1003 as part of the Holy Roman Empire and was situated in the region where the French, Italian and Swiss borders meet. In 1295 the capital was established in Chambéry, in present-day France. The County was upgraded to a Duchy by Holy Roman Emperor Sigismund in 1416. In 1562 the capital was moved to Turin, and the Duchy became known as Piedmont.

Duchy of Savoy in 1494. During the War of the Spanish Succession (1700-1714) the Duchy of Savoy would extend its territory with parts of the Duchy of Milan and the whole of Montferrat and Saluzzo.
The Dukes of Savoy navigated a treacherous geopolitical environment in the following centuries, with France, Spain and Austria trying to exercise control over the region. Parts of Savoy were lost to France, but gains were made acquiring smaller states in north east Italy. The War of the Spanish Succession (1700-1714) increased the prestige of Piedmont. By switching sides during the war it was able to extend its territory at the expense of some Spanish territories in Italy. After swapping Sicily for Sardinia in 1720, a new kingdom of Piedmont-Sardinia, or usually referred to as Sardinia, was established. The Dukes of Savoy gained a royal title.

Flag of Savoy
Napoleonic Wars (1792-1815)
During the 18th century France exerted an increasing pressure on Piedmont-Sardinia. The French Revolution and the early campaigns of Napoleon Bonaparte during the War of the First Coalition (1792-1797) saw the Piedmontese army defeated at the Battle of Montenotte in 1796, ceding Savoy and Nice to France. In 1798 the whole of Piedmont was turned into a French client republic (Piedmontese Republic) but in 1799 the Kingdom of Sardinia was restored after an Austrian victory in the War of the Second Coalition (1798-1802). In 1800 Napoleon reconquered Piedmont and established the Subalpine Republic. The area was annexed to France in 1802, with the Kingdom of Sardinia only remaining on the island.

Italy in 1803. Piedmont was annexed by France but Sardinia was still independent.
Restoration (1815) and Italian Unification (1859-1861)
With the French retreating from Italy, the Kingdom of Sardinia was restored at the Congress of Vienna (1815) and now included the territory of the Ligurian Republic, until 1797 known as the Republic of Genua.

The Kingdom of Sardinia in 1848 with the dates of other Italian States joining Italy during the Second War of Italian Independence (1859-1861) and the 1866 and 1870 campaigns. In return for military assistance, Savoy and Nice were ceded to France in 1860.
In 1848 the Kingdom of Sardinia tried to capture Lombardy-Venetia in a war against Austria but failed. With French help and the military leadership of Giuseppe Garibaldi it was much more successful in 1859 when it annexed Lombardy and started revolutionary movements in most of Italy. By 1861 the Kingdom of Sardinia had expanded to most of Italy except Venetia and Rome, but had to cede Nice to France in return for the military assistance provided.
The Kingdom of Italy was proclaimed in 1861, and the King of Sardinia Vittorio Emanuele II became King of Italy. In 1866 Venetia was added and in 1870 Rome was conquered from the Papal States. The House of Savoy would remain in power until 1946, when the Republic of Italy was established in the aftermath of World War 2.
Currency
Sardinian Scudo
Sardinia had its own currency until the end of the Napoleonic Wars in 1815. The Sardinian Scudo (23.58 grams of .895 silver) was worth 2½ Lire, with 1 Lira = 20 Soldi. The Reale, a unit originally from Spain, was worth 5 Soldi. A Soldo was divided in 6 Cagliaresi or 12 Denari. The Doppietta was a gold coin of 3.21 grams worth 2 Scudi, and the Carlino a gold coin of 16 grams worth 10 Scudi.
Piedmontese Scudo
The Piedmontese Scudo was a silver coin of 35 grams, divided in 6 Lire with 1 Lira = 12 Soldi = 240 Denari. Gold coins were denominated in Doppio (2 Scudi) and Carlino (20 Scudi). During the War with France (1792-1797) debased coins of 25% of actual silver content were struck in denominations of 5, 10 and 20 Soldi, although the Scudo coins retained their pre-war silver content.
The Scudo remained in circulation during the Piedmontese Republic (1797-1798) and the Subalpine Republic (1800-1802), although the Franc was introduced as well during the latter period. The Piedmontese Franc was equal to the French one.
Sardinian Lira (1815-1861)
After the Congress of Vienna the Kingdom of Sardinia unified its currency for both Piedmont and Sardinia. The Lira was introduced at par with the French Franc and was divided in 100 Centesimi. The Sardinian Lira evolved into the Italian Lira after the unification of Italy in 1861. Because of its relation to the French Franc (in contrast to the old Lira) the Sardinian and Italian Lira were often referred to as Francs in Piedmont.
The old Piedmontese Scudo was worth 7,08 Sardinian Lire and the old Sardinian Scudo 4,93 Lire.
Catalogue links:
Savoy - French Feudal (until 1562)
Duchy of Savoy (before 1720)
Kingdom of Sardinia
Piedmontese Republic - Scudo (1798-1799)
Piedmont (Subalpine Republic) - Franc (1800-1802)