During the reign of Louis XIV and Louis XV, at the end of the 17th century, the cathedral underwent major alterations – tombs and stained glass windows were destroyed. During the French Revolution, at the end of the 18th century, many of the cathedral’s treasures were destroyed or stolen.A restoration program was initiated in 1845, overseen by architects Jean-Baptiste-Antoine Lassus and Eugène Viollet-le-Duc. The restoration lasted 23 years, and included the construction of a spire. In 1871, a civil uprising leading to the establishment of the short-lived Paris Commune nearly set fire to the cathedral, and some records suggest that a mount of chairs within the cathedral were set alight. In 1905, the law of ) separation of Church and State was passed; as all cathedrals, Notre-Dame remains state property, but its use is granted to the Roman Catholic Church. In 1991, a major program of maintenance and restoration was initiated, which was intended to last 10 years, but is still in progress as of 2005, the cleaning and restoration of old sculptures being an exceedingly delicate matter.