Stanisław Leszczyński in the context of Augustus II the Strong

In the Great Northern War (1700–1721) a coalition led by Russia successfully contested the supremacy of Sweden in Northern, Central and Eastern Europe. The initial leaders of the anti-Swedish alliance were Peter I of Russia, Frederick IV of Denmark–Norway and Augustus II the Strong of Saxony–Poland–Lithuania. Frederick IV and Augustus II were defeated by Sweden, under Charles XII, and forced out of the alliance in 1700 and 1706, respectively, but rejoined it in 1709 after the defeat of Charles XII at the Battle of Poltava. George I of Great Britain and the Electorate of Hanover joined the coalition in 1714 for Hanover and in 1717 for Britain, and Frederick William I of Brandenburg-Prussia joined it in 1715.

Charles XII led the Swedish Army. Swedish allies included Holstein-Gottorp, several Polish magnates under Stanisław I Leszczyński (1704–1710) and Cossacks under the Ukrainian Hetman Ivan Mazepa (1708–1710). The Ottoman Empire temporarily hosted Charles XII of Sweden and intervened against Peter I.

Augustus III (German: August III.; Polish: August III Sas – "the Saxon"; Lithuanian: Augustas III; 17 October 1696 – 5 October 1763) was King of Poland and Grand Duke of Lithuania from 1733 until 1763, as well as Elector of Saxony in the Holy Roman Empire where he was known as Frederick Augustus II (German: Friedrich August II.).

He was the only legitimate son of Augustus II the Strong, and converted to Catholicism in 1712 to secure his candidacy for the Polish throne. In 1719 he married Maria Josepha, daughter of Joseph I, Holy Roman Emperor, and became elector of Saxony following his father's death in 1733. Augustus was able to gain the support of Charles VI by agreeing to the Pragmatic Sanction of 1713 and also gained recognition from Russian Empress Anna by supporting Russia's claim to the region of Courland. He was elected king of Poland by a small minority on 5 October 1733 and subsequently banished the former Polish king Stanisław I. He was crowned in Kraków on 17 January 1734.

Francis I (Francis Stephen; French: François Étienne; German: Franz Stefan; Italian: Francesco Stefano; 8 December 1708 – 18 August 1765) was Holy Roman Emperor from 1745 to 1765, Archduke of Austria from 1740 to 1765, Duke of Lorraine and Bar from 1729 to 1737, and Grand Duke of Tuscany from 1737 to 1765. He became the ruler of the Holy Roman Empire and Tuscany through his marriage to his second cousin Maria Theresa of Austria, daughter of Emperor Charles VI. Francis was the last non-Habsburg monarch of the Empire. The couple were the founders of the Habsburg-Lorraine dynasty, and their marriage produced sixteen children.

Francis was the oldest surviving son of Leopold, Duke of Lorraine, and the French princess Élisabeth Charlotte d'Orléans. Duke Leopold died in 1729 and was succeeded by his son. In 1736, Francis married Maria Theresa. In 1738, he left the Duchy of Lorraine and Bar for the deposed Polish king Stanisław Leszczyński in exchange for the Grand Duchy of Tuscany, as one of the terms ending the War of the Polish Succession. Following the death of his father-in-law, Charles VI, in 1740, Francis and Maria Theresa became the rulers of the Habsburg domains. Maria Theresa gave her husband responsibility for the empire's financial affairs, which he handled well. Francis died in 1765 and was succeeded by their son, Joseph II, who co-ruled Austria alongside Maria Theresa.

The County of Bar, later Duchy of Bar, was a principality of the Holy Roman Empire encompassing the pays de Barrois and centred on the city of Bar-le-Duc. It was held by the House of Montbéliard from the 11th century. Part of the county, the so-called Barrois mouvant, became a fief of the Kingdom of France in 1301 and was elevated to a duchy in 1354. The Barrois non-mouvant remained a part of the Empire. From 1480, it was united to the imperial Duchy of Lorraine.

Both imperial Bar and Lorraine came under the influence of France in 1735, with Bar ceded to the deposed king of Poland, Stanisław Leszczyński. According to the Treaty of Vienna (1738), the duchy would pass to the French crown upon Stanisław's death, which occurred in 1766.

Emmanuel Héré de Corny (French pronunciation: [emanɥɛl eʁe də kɔʁni]; 12 October 1705 – burial: 2 February 1763) was the court architect to Stanisław Leszczyński, Duke of Lorraine and former King of Poland at his capital of Nancy.

Corny, who was born in Nancy, is famous for the harmonious suite of axial spaces he developed, extending from the Place Stanislas to the Palais du Gouvernement; the sequence is a prime example of eighteenth-century urbanism.

Leszno (Polish pronunciation: [ˈlɛʂnɔ] ; German: Lissa, [ˈlɪsa]) is a historic city in western Poland, seat of Leszno County within the Greater Poland Voivodeship. It is the seventh-largest city in the province with an estimated population of 62,200, as of 2021.

Leszno is a former residential city of prominent Polish magnate families of Leszczyński and Sułkowski, including King Stanisław Leszczyński, under whose patronage it flourished to become one of the major economic and cultural centers of Greater Poland, as reflected in the variety of landmarks, especially of the Baroque period.

The Treaty of Vienna or Peace of Vienna of 1738 ended the War of the Polish Succession. By the terms of the treaty, Stanisław Leszczyński renounced his claim on the Polish throne and recognized Augustus III, Duke of Saxony. As compensation he received instead the duchies of Lorraine and Bar, which were to pass to his daughter, Maria, the wife of King Louis XV of France upon his death. Stanisław died in 1766 and his daughter in 1768.

Francis Stephen, who was the Duke of Lorraine, was indemnified with the vacant throne of the Grand Duchy of Tuscany, the last Medici having died in 1737. France also agreed to the Pragmatic Sanction in the Treaty of Vienna. In another provision of the treaty, the kingdoms of Naples and Sicily were ceded by Austria to Duke Charles of Parma and Piacenza, the younger son of King Philip V of Spain. Charles, in turn, had to cede Parma to Austria, and to give up his claims to the throne of Tuscany in favor of Francis Stephen.