In this innovative study of French political culture, the author re-examines the origins of modern republicanism through the writings and political practices of five key nineteenth-century intellectuals: Jules Barni, Charles Dupont-White, Emile Littré, Eugène Pelletan, and Etienne Vacherot. Drawing on a range of archival and published sources this study explores the transformation of republican ideology, and stresses the continuing influences of Saint-Simonism, socialism, doctrinaire liberalism, and neo-Kantianism on republican thinking during this period. The book sheds new light on French republican conceptions of good citizenship, the meaning of patriotism, the role of the state, the value of individual liberty, and the place of education and religion in public and private life. Offering challenging insights into modern French politics as well as the history of political thought, Intellectual Founders of the Republic opens up new perspectives on republican ideology and political practice.