Leopold II, Holy Roman Emperor in the context of "Declaration of Pillnitz"

Francis II and I (German: Franz II.; 12 February 1768 – 2 March 1835) was the last Holy Roman Emperor as Francis II from 1792 to 1806, and the first Emperor of Austria as Francis I from 1804 to 1835. He was also King of Hungary, Croatia and Bohemia, and served as the first president of the German Confederation following its establishment in 1815.

The eldest son of future Emperor Leopold II and Maria Luisa of Spain, Francis was born in Florence, where his father ruled as Grand Duke of Tuscany. Leopold became Holy Roman Emperor in 1790 but died two years later, and Francis succeeded him. His empire immediately became embroiled in the French Revolutionary Wars, the first of which ended in Austrian defeat and the loss of the left bank of the Rhine to France. After another French victory in the War of the Second Coalition, Napoleon crowned himself Emperor of the French. In response, Francis assumed the title of Emperor of Austria. He continued his leading role as Napoleon's adversary in the Napoleonic Wars, and suffered successive defeats that greatly weakened Austria as a European power. In 1806, after Napoleon created the Confederation of the Rhine, Francis abdicated as Holy Roman Emperor, which in effect marked the dissolution of the Holy Roman Empire. Following the defeat of the Fifth Coalition, Francis ceded more territory to France and was forced to wed his daughter Marie Louise to Napoleon.

Archduke Charles Louis John Joseph Lawrence of Austria, Duke of Teschen (German: Erzherzog Karl Ludwig Johann Josef Lorenz von Österreich, Herzog von Teschen; 5 September 1771 – 30 April 1847) was an Austrian field marshal, the third son of Emperor Leopold II and Maria Luisa of Spain. He was also the younger brother of Francis II, Holy Roman Emperor. He was epileptic, but achieved respect both as a commander and as a reformer of the Austrian Army. He was considered one of Napoleon's most formidable opponents and one of the greatest generals of the French Revolutionary and Napoleonic Wars. Charles wrote several military works as well.

He began his career fighting the revolutionary armies of France. Early in the wars of the First Coalition, he saw victory at Neerwinden in 1793, before being defeated at Wattignies in 1793 and Fleurus in 1794. In 1796, as chief of all Austrian forces on the Rhine, Charles defeated Jean-Baptiste Jourdan at Amberg, Würzburg and Limburg, and then won victories at Wetzlar, Emmendingen and Schliengen that forced Jean Victor Marie Moreau to withdraw across the Rhine. He also defeated opponents at Ostrach, Stockach, Zürich and Mannheim in 1799. He reformed Austria's armies to adopt the nation-at-arms principle. In 1809, he entered the War of the Fifth Coalition and inflicted Napoleon's first major setback at Aspern-Essling, before suffering a defeat at the bloody Battle of Wagram. After Wagram, Charles saw no more significant action in the Napoleonic Wars.

The House of Lorraine (German: Haus Lothringen) originated as a cadet branch of the House of Metz. It inherited the Duchy of Lorraine in 1473 after the death without a male heir of Nicholas I, Duke of Lorraine. By the marriage of Francis of Lorraine to Maria Theresa of Austria in 1736, and with the success in the ensuing War of the Austrian Succession (1740–1748), the House of Lorraine was joined to the House of Habsburg and became known as the House of Habsburg-Lorraine (German: Haus Habsburg-Lothringen). Francis, his sons Joseph II and Leopold II, and his grandson Francis II were the last four Holy Roman emperors from 1745 until the dissolution of the empire in 1806. The House of Habsburg-Lorraine inherited the Habsburg Empire, ruling the Austrian Empire and then Austria-Hungary until the dissolution of the monarchy in 1918.

Although its senior agnates are the dukes of Hohenberg, the house is currently headed by Karl von Habsburg (born 1961), grandson of the last emperor Charles I.

Elisabeth Christine of Brunswick-Wolfenbüttel (28 August 1691 – 21 December 1750) was Princess of Brunswick-Wolfenbuttel, Holy Roman Empress, German Queen, Queen of Bohemia and Hungary; and Archduchess of Austria, etc. by her marriage to Charles VI, Holy Roman Emperor. She was renowned for her delicate beauty and also for being the mother of Empress Maria Theresa and grandmother of Joseph II, Holy Roman Emperor, Leopold II, Holy Roman Emperor, Maria Carolina of Austria and Marie Antoinette of France. She was the longest serving Holy Roman Empress.

Joseph II (13 March 1741 – 20 February 1790) was Holy Roman Emperor from 18 August 1765 and sole ruler of the Habsburg monarchy from 29 November 1780 until his death. He was the eldest son of Empress Maria Theresa and her husband, Emperor Francis I, and the brother of Marie Antoinette, Leopold II, Maria Carolina of Austria, and Maria Amalia, Duchess of Parma. He was thus the first ruler in the Austrian dominions of the union of the Houses of Habsburg and Lorraine, styled Habsburg-Lorraine.

Joseph was a proponent of enlightened absolutism like his brother Leopold II; however, his commitment to secularizing, liberalizing and modernizing reforms resulted in significant opposition, which resulted in failure to fully implement his programs. Meanwhile, despite making some territorial gains, his reckless foreign policy badly isolated Austria. He has been ranked with Catherine the Great of Russia and Frederick the Great of Prussia as one of the three great Enlightenment monarchs. False but influential letters depict him as a somewhat more radical philosophe than he probably was. His policies are now known as Josephinism. He was a supporter of the arts, particularly of composers such as Wolfgang Amadeus Mozart and Antonio Salieri. He died with no known surviving legitimate offspring and was succeeded by his younger brother Leopold II.

Infanta Maria Luisa of Spain (Spanish: María Luisa, German: Maria Ludovika; 24 November 1745 – 15 May 1792) was Holy Roman Empress, German Queen, Queen of Hungary and Bohemia, and Grand Duchess of Tuscany as the spouse of Leopold II, Holy Roman Emperor.