Construction of the Lausanne Cathedral began in 1170. Twenty years later another master mason restarted construction until 1215. Finally a third engineer, Jean Cotereel, completed the majority of the existing cathedral including a porch, and two towers, one of which is the current day belfry. The other tower was never completed. The cathedral was consecrated and dedicated to Our Lady in 1275 by Pope Gregory X, Rudolph of Habsburg, and the bishop of Lausanne at the time, Guillaume of Champvent. The medieval architect Villard de Honnecourt drew the rose window of the south transept in his sketchbook in 1270.
The Protestant Reformation, a movement which came from Zurich, significantly affected the Cathedral. In 1536 a new liturgical area was added to the nave and the colourful decorations inside the Cathedral were covered over. Other major restorations occurred later in the 18th and 19th century which were directed by the great French architect, Eugène-Emmanuel Viollet-le-Duc.
During the 20th century major restorations occurred to restore the painted interior decorations as well as to restore a painted portal on the South side of the Cathedral. New organs were installed in 2003.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.