1823 births

Pierre Laffitte (21 February 1823 – 4 January 1903) was a French positivist philosopher.
Laffitte was born at Béguey, Gironde. Residing at Paris as a teacher of mathematics, he became a disciple of Auguste Comte, who appointed him his literary executor. On the schism of the Positivist body which followed Comte's death, he was recognized as head of the section which accepted the full Comtian doctrine; the other section adhered to Émile Littré, who rejected the religion of humanity as inconsistent with the philosophy of science of Comte's earlier period. From 1853 Laffitte delivered Positivist lectures in the room formerly occupied by Comte in the rue Monsieur le Prince. He published Les Grands Types de l'humanité (1875) and Cours de philosophie première (1889). In 1893 he was appointed to the new chair founded at the Collège de France for the exposition of the general history of science, and it was largely due to his inspiration that a statue to Comte was erected in the Place de la Sorbonne in 1902. Laffitte died in Paris.
Lafitte with a delegation of positivists visited Constantinople in 1877 visited Midhat Pasha to advocate positivist principles as a non-Christian, modern system.

Théodore Faullain de Banville (14 March 1823 – 13 March 1891) was a French poet and writer. His work was influential on the Symbolist movement in French literature in the late 19th century.

Édouard-Victoire-Antoine Lalo (27 January 1823 – 22 April 1892) was a French composer. His most celebrated piece is the Symphonie Espagnole, a five-movement concerto for violin and orchestra that remains a popular work in the standard repertoire.

Sergeant François Bertrand (1823–1878), known as the Vampire of Montparnasse, was a sergeant in the French Army. He was arrested in 1849 for necrophilia and jailed for one year. In 1856, he moved to Le Havre. In his later life, he worked as clerk, mailman, and lighthouse keeper. He died on 25 February 1878.