House of Habsburg-Lorraine in the context of "Maximilian I of Mexico"

The Second Mexican Empire (Spanish: Segundo Imperio mexicano; French: Second Empire mexicain), officially known as the Mexican Empire (Spanish: Imperio Mexicano), was a constitutional monarchy established in Mexico by Mexican monarchists with the support of the Second French Empire. This period is often referred to as the Second French intervention in Mexico. French Emperor Napoleon III, with backing from Mexican conservatives, the clergy, and nobility, aimed to establish a monarchist ally in the Americas as a counterbalance to the growing power of the United States.

The throne of Mexico was offered by Mexican monarchists, who had lost a civil war against Mexican liberals, to Austrian Archduke Maximilian of the House of Habsburg-Lorraine, who had ancestral ties to the rulers of colonial Mexico. Maximilian's ascension was ratified through a controversial referendum. His wife, Belgian princess Charlotte of the House of Saxe-Coburg and Gotha, became the empress consort of Mexico, known locally as "Carlota."

The Habsburg monarchy, also known as Habsburg Empire, or Habsburg Realm (/ˈhæpsbɜːrɡ/), and Danube Monarchy, was the collection of empires, kingdoms, duchies, counties and other polities (composite monarchy) that were ruled by the House of Habsburg. From 1804 it was referred to as the Austrian Empire, and from 1867 as Austria-Hungary.

The history of the Habsburg monarchy can be traced back to the election of Rudolf I as King of Germany in 1273 and his acquisition of the Duchy of Austria for the Habsburgs in 1282. In 1482, Maximilian I acquired the Netherlands through marriage. Both realms passed to his grandson and successor, Charles V, who also inherited the Spanish throne and its colonial possessions, and thus came to rule the Habsburg empire at its greatest territorial extent. The abdication of Charles V in 1556 led to a division within the dynasty between his son Philip II of Spain and his brother Ferdinand I, who had served as his lieutenant and the elected king of Hungary, Croatia and Bohemia. The Spanish branch (which held all of Iberia, the Netherlands, and lands in Italy) became extinct in the male line in 1700, but continued through the female line through the House of Bourbon. The Austrian branch (which ruled the Holy Roman Empire, Hungary, Bohemia and various other lands) was itself split into different branches in 1564 but reunited 101 years later. It became extinct in the male line in 1740, but continued through the female line as the House of Habsburg-Lorraine.

The Kingdom of Lombardy–Venetia, commonly called the "Lombardo-Venetian Kingdom", was a constituent land (crown land) of the Austrian Empire from 1815 to 1866. It was created in 1815 by resolution of the Congress of Vienna in recognition of the Austrian House of Habsburg-Lorraine's rights to the former Duchy of Milan and the former Republic of Venice after the Napoleonic Kingdom of Italy, proclaimed in 1805, had collapsed.

The kingdom survived for only fifty years—the region of Lombardy was ceded to France in 1859 after the Second Italian War of Independence, which then immediately ceded it to the Kingdom of Sardinia. Lombardy-Venetia was finally dissolved in 1866 when its remaining territory was incorporated into the recently proclaimed Kingdom of Italy following the kingdom's victory against Austria in the Third Italian War of Independence.

Archduke (feminine: archduchess; German: Erzherzog, feminine form: Erzherzogin) was the title borne from 1358 by the Habsburg rulers of the Archduchy of Austria, and later by all senior members of that dynasty. It denotes a rank within the former Holy Roman Empire (962–1806), which was below that of emperor, and roughly equal to that of king, prince-(arch)bishop, and grand duke, but above that of sovereign prince and duke.

The territory ruled by an archduke or archduchess was called an archduchy. All remaining archduchies ceased to exist in 1918. The current head of the House of Habsburg is Karl Habsburg.

Franz Joseph I or Francis Joseph I (German: Franz Joseph Karl [fʁants ˈjoːzɛf ˈkaʁl]; Hungarian: Ferenc József Károly [ˈfɛrɛnt͡s ˈjoːʒɛf ˈkaːroj]; 18 August 1830 – 21 November 1916) was Emperor of Austria, King of Hungary, and the ruler of the other states of the Habsburg monarchy from 2 December 1848 until his death in 1916. In the early part of his reign, his realms and territories were referred to as the Austrian Empire, but in 1867 they were reconstituted as the dual monarchy of Austria-Hungary. From 1 May 1850 to 24 August 1866, he was also president of the German Confederation.

In December 1848, Franz Joseph's uncle Emperor Ferdinand I abdicated the throne at Olomouc, as part of Minister President Felix zu Schwarzenberg's plan to end the Hungarian Revolution of 1848. Franz Joseph then acceded to the throne. In 1854, he married his first cousin Duchess Elisabeth in Bavaria, with whom he had four children: Sophie, Gisela, Rudolf, and Marie Valerie. Largely considered to be a reactionary, Franz Joseph spent his early reign resisting constitutionalism in his domains. The Austrian Empire was forced to cede its influence over Tuscany and most of its claim to Lombardy–Venetia to the Kingdom of Sardinia, following the Second Italian War of Independence in 1859 and the Third Italian War of Independence in 1866. Although Franz Joseph ceded no territory to the Kingdom of Prussia after the Austrian defeat in the Austro-Prussian War, the Peace of Prague (23 August 1866) settled the German Question in favour of Prussia, which prevented the unification of Germany from occurring under the House of Habsburg.