The Bourbon conquest of the Two Sicilies took place between 1734 and 1735 during the War of the Polish Succession, when Spain, under Philip V, invaded the Kingdom of Naples and the Kingdom of Sicily, both then under Austrian dominion.
In keeping with the balance of power politics that governed 18th-century international relations, the victorious military campaign did not result in the two kingdoms reverting to Spanish viceroyalties as in previous centuries. Instead, they regained their former independence. Philip V's son by his second wife, Elisabeth Farnese, the Infante Don Charles—already Duke of Parma—ascended the throne as the first ruler of the Bourbon dynasty of Naples.
The conquest sparked tensions with Pope Clement XII, who, as holder of centuries-old feudal rights over the kingdoms, granted Charles investiture only in May 1738. International recognition of the new dynasty came in November of that year with the Treaty of Vienna (1738), at the cost of ceding the Duchy of Parma and Piacenza to the Habsburgs and the Grand Duchy of Tuscany to the Lorraine dynasty.
The Two Sicilies contested between Habsburgs and Bourbons
At the dawn of the 18th century, the death of Spain's Charles II without direct heirs marked the extinction of the Spanish Habsburg line and hastened the irreversible decline of Iberian power. The ensuing dynastic crisis pitted the Bourbons of France against the Imperial Habsburgs, who respectively supported Philip of Anjou, grandson of France's Louis XIV, and Archduke Charles of Habsburg, younger son of Emperor Leopold I, for the Spanish throne. Benefiting from Charles II's will, Philip occupied Spain in early 1701 and was crowned as Philip V.
After two centuries of Spanish viceregal rule, Neapolitan nobles began to nurture aspirations for independence, seeing the dynastic crisis as a chance to break free from Iberian control. When the War of the Spanish Succession erupted, Emperor Leopold, aiming to win Neapolitan favor, declared in August 1701:
This prospect of a resident sovereign rallied part of the kingdom's nobility to the Habsburg cause. In September, they launched an unsuccessful uprising against Philip V's loyal viceroy, Duke of Medinaceli, known as the Conspiracy of Macchia.Michelangelo Schipa, "Macchia, congiura di", Enciclopedia Italiana, 1934. To solidify his rule and counter Austrian-backed anti-Bourbon propaganda, Philip V visited Naples in 1702, arriving on 17 April to great festivities and remaining until 2 June.. He granted favors to the populace and titles to loyal nobles—the first Spanish king to visit his Italian domains in over a century and a half.Nino Cortese, "Filippo V", Enciclopedia Italiana, 1932.The last was Charles V, who visited Sicily and resided in Naples from 25 November 1535 to 22 March 1536. See Lorenzo Giustiniani, "Dizionario geografico-ragionato del Regno di Napoli", Naples, 1802, vol. V, p. 250. However, the Italian front of the war soon turned in Austria's favor, and in 1707, Habsburg forces invaded and swiftly conquered the Kingdom of Naples. Despite the dynastic shift, Neapolitan hopes for independence remained unfulfilled, as Archduke Charles ruled from abroad—first from Barcelona, where he had been proclaimed King Charles III of Spain in 1704, and later from Vienna after succeeding his brother Joseph I as Emperor Charles VI in 1711.
The Peace of Utrecht (1713) and Treaty of Rastatt (1714), which concluded the conflict, left Philip V with only Spain and its overseas colonies, dismantling the European holdings of the Spanish Empire. Spanish dominance in Italy ended, with the Kingdom of Naples (including the Tuscan Presidi), the Kingdom of Sardinia, and the Duchy of Milan ceded de jure to Charles VI, who already held them de facto. The Kingdom of Sicily passed to Duke Victor Amadeus II of Savoy, who was elevated to the rank of king. In Naples, Spanish viceregal rule gave way to Austrian governance, heavily influenced by Spanish exiles—mostly Catalans—who had sided with Charles VI. To the Emperor, who reluctantly abandoned his claim to Spain, these loyal subjects were invaluable, surpassing even the ablest Germans or Italians in governing former Spanish territories..
Austrian rule in Naples thus bore the dual imprint of Habsburg and Spanish domination, doubling the burden on its subjects. Yet, bolstered by the exile of many Bourbon supporters, Austria maintained firm control, enjoying broad popular support. Among the nobility, despite initial pro-Habsburg independence aspirations, some argued that being subjects of a small independent monarchy was less advantageous than serving a vast imperial one. The former offered only provincial administration, while the latter opened paths to governing viceroyalties or commanding large military forces. Barons also benefited from reforms that weakened viceregal authority, allowing freer management of their fiefs, and found refuge in Vienna from local justice..
Charles of Bourbon's arrival in Italy
The following years saw Spain pursue military and diplomatic efforts to reclaim territory and influence in Italy. These expansionist ambitions gained momentum from both national revanche and the driving force behind Bourbon foreign policy: Queen Elisabeth Farnese, Philip V's second wife. Born an Italian princess, Farnese brought dynastic claims to her native Duchy of Parma and Piacenza and the neighboring Grand Duchy of Tuscany. These states, ruled by the waning Farnese and Medici dynasties, were also coveted by Emperor Charles VI due to their feudal ties to the Holy Roman Empire.
On 20 January 1716, Elisabeth gave birth to Infante Don Charles, whose placement on a throne became her paramount concern and Spain's ultimate international objective. With the Spanish throne seemingly out of reach—preceded by his half-brothers Louis and Ferdinand—Charles's only path to a crown lay in Italy. Spain's first attempt to regain ground came in 1717–1718 with invasions of Sardinia and then Sicily. Austria, Britain, the United Provinces, and even France—Philip V's homelandIn Paris, Regent Philippe II of Orléans governed, contested by Philip V over the guardianship of young Louis XV and thus control of France. In 1718, Spain's failed Cellamare conspiracy to depose the regent prompted French intervention. See Giuseppe Scichilone, "Cellamare, Antonio del Giudice, duca di Giovinazzo, principe di", Dizionario Biografico degli Italiani, vol. 23, 1979.—formed an alliance against Spain (Treaty of London (1718)). The resulting War of the Quadruple Alliance ended in Spanish defeat, restoring the Utrecht equilibrium.
The victorious powers forced Spain to accept the Treaty of The Hague (1720), which recognized Charles's rights to Parma and Tuscany but reaffirmed their feudal subordination to the Empire. To legitimately take possession, Charles required investiture from Charles VI, who viewed a Bourbon dynasty in central Italy with suspicion, fearing it as a stepping stone to broader encroachment. The treaty also saw Charles VI trade Sardinia for Sicily with Victor Amadeus II, uniting the Two Sicilies under his rule. However, the kingdoms remained politically distinct, each governed by separate viceroys as under Spanish rule.
Upon the childless death of Parma's Duke Antonio Farnese in October 1731, an Anglo-Spanish fleet landed 6,000 soldiers at Livorno. In December, the 15-year-old Charles arrived, entrusted to his tutor, Count of Santisteban. Ignoring imperial investiture per Madrid's directives, he took possession of Tuscany—set to inherit it upon Grand Duke Gian Gastone de' Medici's death—and settled in the Farnese duchy, governed by his maternal grandmother, Dowager Duchess Dorothea Sophie of Neuburg. By bypassing feudal obligations, Charles strained Austria-Spain relations, setting the stage for war and prompting Madrid to devise bolder conquest plans..
Outbreak of the War of the Polish Succession
The casus belli for a new European conflict arose in 1733 with the death of Poland's Augustus II. The Polish–Lithuanian Commonwealth, as an elective monarchy, chose between Saxony's Elector Frederick Augustus II—son of the late king, backed by Russia, Austria, and Prussia—and Stanisław Leszczyński, supported by Sweden and France, where he was Louis XV's father-in-law. Leszczyński's election in September was overturned by Russian intervention, which secured Augustus III's crowning. Unable to strike Russia directly, France allied with Sardinia under Charles Emmanuel III and declared war on Austria in October, attacking along the Rhine and in Lombardy. Paris also courted Spain's entry into the Franco-Sardinian league.
Initially, Elisabeth Farnese aimed to secure for her sons—Charles, followed by Philip and Luis—the Polish throne, the Two Sicilies, Flanders, and the Duchy of Mantua, merging the latter with Charles's central Italian holdings. Philip V sought to restore a Spanish empire encompassing territories lost in 1713. France's chief minister, Cardinal Fleury, balanced Spanish ambitions with the Treaty of Turin (1733), signed 26 September with Charles Emmanuel III, assigning Milan to Sardinia and the Two Sicilies, including the State of the Presidi, to Charles, without requiring Sardinian military aid.. Spain refused, demanding that Franco-Sardinian forces join Charles in conquering all Austrian Italian territories—except Milan—for his immediate rule..
French troops under the aged Marshal Villars joined Charles Emmanuel to conquer Lombardy within three months. Meanwhile, Louis XV persuaded Philip V to forge a Bourbon alliance via the Treaty of the Escorial (7 November 1733), or Family Compact, granting Charles his conquests and existing states.
This treaty clashed with Turin's terms, sparking a dispute over Mantua, promised to both Elisabeth Farnese and Charles Emmanuel. Fearing Mantua's loss would stifle Sardinia's expansion and expose Lombardy to Spain, Charles Emmanuel proposed ceding it to a French-favored foreign ruler, Elector of Bavaria. Fleury insisted Mantua was essential for Spain's coalition entry. Charles Emmanuel relented but delayed its siege, citing weather, risks to occupied lands, and logistical shortages.
Villars, irked by Sardinia's refusal, saw his bold plans rejected by French commanders Coigny and Broglie.The Mantua dispute, from Charles Emmanuel's perspective, is detailed in . Marshal Rehbinder backed Villars but was sacked.Davide Bertolotti, "Istoria della Real Casa di Savoia", Milan, Antonio Fontana, 1830, p. 265. Elisabeth thus reversed Spain's strategy, prioritizing the Two Sicilies over joining the Franco-Sardinian Alpine and Mantuan campaigns..
Spanish forces arrived in Livorno in late 1733 under Captain General Count of Montemar, famed for seizing Oran from Ottoman Algeria in 1732. Ten lieutenant generals were appointed, led by Frenchman Manuel d'Orléans, Count of Charny, who had commanded the 1731 Tuscany expedition. Others included Jacobite James Fitz-James StuartSon of the first Duke of Berwick and Liria, who died months later at France's Siege of Philippsburg (1734), passing on his titles. and Neapolitan Francesco Eboli, Duke of Castropignano. On 24 December, Eboli captured the Brunella Fortress in Lunigiana, a key strategic link between Tuscany and Emilia. From Pisa, Montemar notified Villars of the impending southern invasion on 7 January 1734, then joined Charles in Parma. Named generalissimo of His Most Catholic Majesty's Italian armies—a ceremonial role, with Montemar in true command—Charles declared himself free of tutelage on his 18th birthday, 20 January, per parental orders. His mother wrote, urging him to march on the Two Sicilies: "Once elevated to a free kingdom, they will be yours. Go then and conquer: Italy's finest crown awaits you".; .