former Gonzaga duchy of Guastalla. Elisabeth died in 1766. Later Bourbon monarchs outside France Upon the fall of the French Empire, Ferdinand I was restored to the throne of the Kingdom of the Two Sicilies in 1815, founding the House of Bourbon-Two Sicilies. His subjects revolted in 1820 and he was forced to grant a constitution; Austria invaded in March 1821 and revoked the constitution. He was succeeded by his son, Francis I, in 1825 and by his grandson, Ferdinand II, in 1830. Another revolution erupted in January 1848 and Ferdinand was also forced to grant a constitution. This constitution was revoked in 1849. Ferdinand was succeeded by his son, Francis II, in May 1859. When Giuseppe Garibaldi captured Naples in 1860, Francis restored the constitution in an attempt to save his sovereignty. He fled to the fortress of Gaeta, which was captured by the Piedmontese troops in February 1861; his kingdom was incorporated into the Kingdom of Italy on 17 March 1861, after the fall the fortress of Messina (surrendered on 12 March), although the Neapolitan troops in Civitella del Tronto resisted three days longer. After the fall of Napoleon, Napoleon's wife, Maria Louisa, was made Duchess of Parma. As compensation, Charles Louis, the former king of Etruria, was made the Duke of Lucca. When Maria Louisa died in 1847 he was restored to Parma as Charles II. Lucca was incorporated into Tuscany. He was succeeded by his son, Charles III, and grandson, Robert I, in 1854. The people of Parma voted for a union with the kingdom of Sardinia in 1860. After Italian unification the next year, the Bourbon dynasty in Italy was no more. Ferdinand VII was restored to the throne of Spain in March 1814. Like his Italian Bourbon counterpart, his subjects revolted against him in January 1820 and he was forced to grant a constitution. A French army invaded in 1823 and the constitution was revoked. Ferdinand married his fourth wife, Maria Christina, the daughter of Francis I, the Bourbon king of Sicily, in 1829. Despite his many marriages he did not have a son, so in 1833 he was influenced by his wife to abolish the Salic Law so that their daughter, Isabella, could become queen depriving his brother, Don Carlos, of the throne. Isabella II succeeded her father when he died in 1833. She was only three years old and Maria Cristina, her