restoration of buildings such as the Romanesque church of in Saint-Sulpice, the in Lausanne, and the Lausanne Cathedral. The initial lead architect of the restoration at Chillon was , who had worked with de Geymüller in restoring Lausanne Cathedral. He initiated a general survey of the fortress, which was continued and intensified by his replacement as lead architect-archaeologist, , who played a major role in the development of archaeology in the Canton of Vaud. Naef devoted twenty years to the study of Chillon. Subordinating aesthetics to historical accuracy, he undertook detailed research into historical archives and conducted extensive archaeological excavations. The process was conscientiously documented in plans, sketches, photographs, and a journal kept by Naef. Until it was abandoned in 1908 the restoration followed a painstaking process of indicating replacement stones with inscriptions on the cut stone (R = Restored; RFS = Restoration facsimile; RL = Free Restoration), or by a change of colour or a red line on the masonry. Naef also restored the interior of the castle, including the tapestries of certain rooms such as the great room of the bailiff, also called the "great Bernese kitchen". The creation in 1887 of The Association for the Restoration of Chillon. From the outset, the Association aimed for an "artistic" restoration with the intention of "giving back to objects the character with which they were clothed, almost a latent life, a life impression of the ideas of their time". It is also planned to create a historical museum at the castle. The appointment in 1889 of a Technical Commission comprising renowned art historians and architects who specialised in monument restoration. Alongside Rahn and de Geymüller, it included Théodore Fivel, architect in Chambéry and connoisseur of Savoyard castle architecture, , restorer of the , and State architect Henri Assinare. The Commission first met on 27 October 1890 and closely supervised the restoration over subsequent years. De Geymüller played a key role in its success. Drawing on principles published in 1865, and enhanced in 1888, by the Royal Institute of British Architects, he established a framework in the Milestones for the Restoration Program printed in Lausanne in 1896. Naef also joined the Technical Commission on the death of Fivel in 1895. The adoption by the Canton of Vaud in 1898 of a law on historic monuments, the first of its kind in Switzerland, which planned to establish a cantonal Commission for historic