19th-century philosophers

Anne Louise Germaine de Staël-Holstein (French: [an lwiz ʒɛʁmɛn də stal ɔlstajn]; née Necker; 22 April 1766 – 14 July 1817), commonly known as Madame de Staël (French: [madam də stal]), was a prominent woman of letters and political theorist in both Parisian and Genevan intellectual circles. She was the daughter of banker and French finance minister Jacques Necker and Suzanne Curchod, a respected salonhostess. Throughout her life, she held a moderate stance during the tumultuous periods of the French Revolution and the Napoleonic era, persisting until the time of the French Restoration.Her presence at critical events such as the Estates General of 1789 and the 1789 Declaration of the Rights of Man and of the Citizen underscored her engagement in the political discourse of her time. However, Madame de Staël faced exile for extended periods: initially during the Reign of Terror and subsequently due to personal persecution by Napoleon. She claimed to have discerned the tyrannical nature and ambitions of his rule ahead of many others.During her exile, she fostered the Coppet group, a network that spanned across Europe, positioning herself at its heart. Her literary works, emphasizing individuality and passion, left an enduring imprint on European intellectual thought. De Staël's repeated championing of Romanticism contributed significantly to its widespread recognition.While her literary legacy has somewhat faded with time, her critical and historical contributions hold undeniable significance. Though her novels and plays may now be less remembered, the value of her analytical and historical writings remains steadfast. Within her work, de Staël not only advocates for the necessity of public expression but also sounds cautionary notes about its potential hazards.

Christoph von Sigwart (28 March 1830 – 4 August 1904) was a German philosopher and logician. He was the son of philosopher Heinrich Christoph Wilhelm Sigwart (31 August 1789 – 16 November 1844).

Louis Francisque Lélut (1804–1877) was a French medical doctor and philosopher known for his works Démon de Socrate and L'Amulette de Pascal, where he stated that Socrates and Blaise Pascal were insane.
Born at Gy, a small village in the Haute-Saône department, he was member of the Academy of Moral and Political Sciences and researched mental illnesses and phrenology. His main work was Physiologie de la pensée, published in 1861.
During the Second French Empire he was member of the Legislative Body.

Aleksander Świętochowski (18 January 1849 – 25 April 1938) was a Polish writer, educator, and philosopher of the Positivist period that followed the January 1863 Uprising.
He was widely regarded as the prophet of Polish Positivism, spreading in the Warsaw press the gospel of scientific inquiry, education, economic development, and equality of rights for all, without regard to sex, class, ethnic origin or beliefs. His was a nuanced vision, however, that took account of the shortcomings of human nature; like H.G. Wells, he advocated that power in society be wielded by the most enlightened among its members.

Léon Brunschvicg (French: [leɔ̃ bʁœ̃svik]; 10 November 1869 – 18 January 1944) was a French Idealist philosopher. He co-founded the Revue de métaphysique et de morale with Xavier Léon and Élie Halévy in 1893.