Canton of Basel in the context of "Basel-City"

Abel Seyler (23 August 1730, Liestal – 25 April 1800, Rellingen) was a Swiss-born theatre director and former merchant banker, who was regarded as one of the great theatre principals of 18th century Europe. He played a pivotal role in the development of German theatre and opera, and was considered "the leading patron of German theatre" in his lifetime. He supported the development of new works and experimental productions, helping to establish Hamburg as a center of theatrical innovation and to establish a publicly funded theater system in Germany. Working with some of Germany's foremost actors and playwrights of his era, he is credited with pioneering a new more realist style of acting, introducing Shakespeare to a German language audience, and with promoting the concept of a national theatre in the tradition of Ludvig Holberg, the Sturm und Drang playwrights, and serious German opera, becoming the "primary agent for change in the German opera scene" in the late 18th century. Already in his lifetime, he was described as "one of German art's most meritorious men."

The son of a Basel Reformed priest, Seyler moved to London and then to Hamburg as a young adult, and established himself as a merchant banker in the 1750s. During the Seven Years' War and its immediate aftermath his bank Seyler & Tillemann engaged in an ever-increasing and complex, "malicious" speculation with financial instruments and went spectacularly bankrupt with enormous debts in the wake of the Amsterdam banking crisis of 1763, resulting in a decade of expansive litigation. Although they were wealthy bankers, Seyler and his business partner were "in no way representatives of the Hamburg bourgeoisie." A flamboyant bon vivant who was regarded with suspicion in Hamburg, Seyler symbolized a new and more aggressive form of capitalism.

The Faesch family, also spelled Fesch, is a prominent Swiss, French, Belgian, Corsican and Italian noble family, originally a patrician family of Basel. Known since the early 15th century, the family received a confirmation of nobility from the Holy Roman Emperor in 1563. It was continuously represented in the governing bodies of the city-republic of Basel for centuries, and three members served as Burgomasters, i.e. heads of state, namely Remigius Faesch (1541–1610), Johann Rudolf Faesch (1572–1659) and Johann Rudolf Faesch (1680–1762). The family was at times the richest family of Basel, and its rise was partially the result of clever marriage policies.

In the 18th century, the naval officer Franz Fesch (1711–1775) entered the service of the Republic of Genoa and established a branch in Corsica. Its most famous member, Cardinal Joseph Fesch (1763–1839), was the uncle of Napoleon Bonaparte and was a member of the French imperial family during his nephew's rule. He became a French senator and a count in 1805, was elevated to sovereign princely rank in 1806, and was granted the title of a Prince of France in 1807, a dignity held only by himself, Napoleon's siblings, Joachim Murat and Eugène de Beauharnais. He was a member of the Imperial House and in the order of succession to the French imperial throne in accordance with the French constitution of 1804 (Title III, Article 9, "The Imperial Family"). He was also made a Peer of France in 1815, and subsequently given the title of (Roman) Prince by the Pope. The Fesch Palace in Ajaccio today houses the Musée Fesch, one of France's finest collections of old masters and one of the most important Napoleonic collections.