House of Lorraine in the context of Hohenberg family

The House of Habsburg-Lorraine (German: Haus Habsburg-Lothringen) originated from the marriage in 1736 of Francis III, Duke of Lorraine and Bar, and Maria Theresa of Austria, later successively Queen of Bohemia, Queen of Hungary, Queen of Germany, Queen of Croatia and Archduchess of Austria, etc. etc. Its members form the legitimate surviving line of both the House of Habsburg and the House of Lorraine, and they inherited their patrimonial possessions from the female line of the House of Habsburg and from the male line of the House of Lorraine.

The House of Lorraine's branch of Vaudémont and Guise became the main branch after a brief interlude in 1453–1473, when the duchy passed in right of Charles de Bourbon's daughter to her husband, John of Calabria, a Capetian. Lorraine reverted to the House of Vaudémont, a junior branch of the House of Lorraine, in the person of René II, who later added to his titles that of Duke of Bar.

The Duchy of Lorraine was a principality of the Holy Roman Empire which existed from the 10th century until 1766 when it was annexed by the Kingdom of France. It gave its name to the larger present-day region of Lorraine in northeastern France. Its capital was Nancy.

It was founded in 959 following the division of Lotharingia into two separate duchies: Upper and Lower Lorraine, the westernmost parts of the Holy Roman Empire. The Lower duchy was quickly dismantled, while Upper Lorraine came to be known as simply the Duchy of Lorraine. The Duchy of Lorraine was coveted and briefly occupied by the dukes of Burgundy and the kings of France, but was ruled by the dukes of the House of Lorraine after 1473.

The Duchy of Teschen (German: Herzogtum Teschen), also Duchy of Cieszyn (Polish: Księstwo Cieszyńskie) or Duchy of Těšín (Czech: Těšínské knížectví), was one of the Duchies of Silesia centered on Cieszyn (Teschen) in Upper Silesia. It was split off the Silesian Duchy of Opole and Racibórz in 1281 during the feudal division of Poland and was ruled by Silesian dukes of the Piast dynasty from 1290 until the line became extinct with the death of Duchess Elizabeth Lucretia in 1653.

The ducal lands initially comprised former Lesser Polish territories east of the Biała River, which in about 1315 again split off as the Polish Duchy of Oświęcim, while the remaining duchy became a fiefdom of the Bohemian kings in 1327 and was incorporated into the Lands of the Bohemian Crown in 1348. While the bulk of Silesia was conquered by the Prussian king Frederick the Great in the Silesian Wars of 1740–1763, Teschen together with the duchies of Troppau (Opava), Krnov and Nysa remained with the Habsburg monarchy and merged into the Austrian Silesia crown land in 1849. The so-called "commander line" of the Habsburg-Lorraine dynasty, a cadet branch descending from Archduke Charles, Duke of Teschen, held the title "Duke of Teschen" until 1918.

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.

Mary of Guise (French: Marie de Guise; 22 November 1515 – 11 June 1560), also called Mary of Lorraine, was Queen of Scotland from 1538 until 1542, as the second wife of King James V. She was a French noblewoman of the House of Guise, a cadet branch of the House of Lorraine and one of the most powerful families in France. As the mother of Mary, Queen of Scots, she was a key figure in the political and religious upheaval that marked mid-16th-century Scotland, ruling the kingdom as queen regent on behalf of her daughter from 1554 until her death in 1560.

The eldest of the twelve children born to Claude, Duke of Guise, and Antoinette of Bourbon, in 1534 Mary was married to Louis II d'Orléans, Duke of Longueville, the Grand Chamberlain of France. The marriage was arranged by King Francis I of France, but proved shortlived. The Duke of Longueville died in 1537, and the widower kings of England and Scotland, Henry VIII and James V, both sought the Duchess of Longueville's hand. After much persuasion from Francis I and James V, who wrote a personal letter pleading for her hand and counsel, Mary eventually relented and agreed to marry the King of Scots. Following the new queen's arrival in Scotland, James and Mary were married in person in June 1538 at St Andrews Cathedral. Mary was crowned queen at Holyrood Abbey on 22 February 1540, and the marriage produced three children in quick succession: James, Duke of Rothesay; Robert, Duke of Albany; and Mary. Both sons died in April 1541, just 14 hours apart, and when James V himself died in December 1542, his only surviving heir, Mary, became Queen of Scots at the age of six days old.