Eugène Viollet-le-Duc was a French architect and theorist born in 1814, known for his work in the Gothic Revival style. He is famous for restoring several historic buildings in France, including the Notre-Dame Cathedral and the Château de Pierrefonds. His approach combined historical accuracy with innovative techniques, influencing modern conservation practices. In addition to his architectural work, Viollet-le-Duc wrote extensively on architecture and design, emphasizing the importance of understanding historical styles. His influential writings, such as the multi-volume Dictionnaire raisonné de l'architecture française du XIe au XVIe siècle, continue to be referenced by architects and historians today.