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Pierre-Joseph Proudhon, widely regarded as the "father of anarchism," was born on January 15, 1809 in Besançon, France. He is best known for his influential works, including "What Is Property?" and "The System of Economic Contradictions," which laid the foundation for anarchist thought and challenged conventional notions of property, capitalism, and the state. Proudhon's writings continue to inspire and influence philosophical and political discourse to this day.