Eugène Emmanuel Viollet-le-Duc (Paris, January 27 1814 - Lausanne 1879) was a French architect, famous for his restorations of medieval buildings. He was as central a figure in the Gothic Revival in france as he was in the public discourse on "honesty" in architecture, which eventually transcended all revival styles, to inform the moving spirit of Modernism.

In the early 1830s, the beginnings of a movement for the restoration of medieval buildings appeared in France. Viollet-le-Duc, returning from a study trip to Italy, was ordered by Prosper Merimée to restore Vezelay abbey. This work marked the beginning of a long series of restorations. Modern practice finds Viollet-le-Duc's restorations too free, too personal, too interpretive, but many of the monuments he restored would have otherwise been lost.

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Restoration of the Château of Pierrefonds, reinterpreted by Viollet-le-Duc for Napoleon III, was interrupted by the departure of the Emperor in 1870.]] Among his restorations:

• Churches :
  • Sainte-Marie-Madeleine, Vezelay
  • Notre-Dame de Paris
  • Saint Denis Basilica, near Paris
  • Saint-Louis, in Poissy, France
  • Semur
  • Saint-Nazaire, in Carcassonne, France
  • Saint-Sernin, in Toulouse, France

• Town Halls :
  • Saint-Antonin
  • Narbonne

• Castles :
  • Pierrefonds
  • Fortified city of Carcassonne
  • Château de Coucy

Viollet-le-Duc applied the lessons of Gothic architecture, especially what he conceived of its structural systems, to modern building materials such as cast iron. He practiced as archaeologically precise (for his time) a style of restoration as he could manage, but his own designs were remarkably innovative. His approach to both medieval and modern architecture was severely rational, in keeping with his own unsentimental appreciation of the Gothic achievement.

Some of his restorations, such as that of the castle of Pierrefonds, were highly controversial because they did not aim so much at accurately recreating a historical situation as much as at creating a "perfect building" of medieval style.

The famous Catalan architect Antoni Gaudí was under strong influence of Gothic architecture revival of Viollet-le-Duc.

Throughout his career he also kept taking notes and drawings, not only on the buildings he was working on, but also on Romanesque, Gothic and Renaissance buildings that were to be soon demolished. His study of medieval and Renaissance periods was not limited to architecture, but extended to furniture, clothing, musical instruments, armament ...

All this work was published, first in serial, and then as full-scale books, as:

• the Dictionary of French Architecture from 11th to 16th Century (1854-1868) (Dictionnaire raisonné de l'architecture française du XIe au XVIe siècle)
• the Dictionary of French Furnishings (1858-1870) (Dictionnaire raisonné du mobilier français de l'époque Carolingienne à la Renaissance.)
• Viollet-le-Duc systematized his approach to architecture and architectural education in the Entretiens sur l'architecture (in 2 volumes, 1858-72). In Henry Van Brunt's translation, the "Discourses on Architecture" was published in 1875, making it available to an American audience little more than a decade after its initial publication in France.

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