The Church of Saint-Nizier name refers to Nicetius of Lyon, a bishop of the city during the 6th century. The first religious building on the site of the present church was a Roman monument, perhaps a temple of Attis, whose worship was probably the cause of the Christian persecution in Lyon from 177. In the 5th century, according to tradition, Eucherius of Lyon, 19th bishop of Lyon, built on the ruins of the building a basilica to contain the relics of the martyrs in Lyon, tortured in 177. In the 6th century, the bishops were buried in the church, particularly Nicetius of Lyon, the 28th bishop. The body of the latter attracted a crowd and his presumed great miracles led the church to take his name.
In the early 8th century, the church has been ravaged by the Saracens and by Charles Martel. It was rebuilt in the 9th century, at the behest of the bishop Leidrade. Peter Waldo, in the 13th century, was a parishioner. His disciples, shocked by the wealth of the church, even set fire in 1253.
From the 14th century to the late 16th century, the church was gradually rebuilt. In 1562, the notables gathered in the church, and in the 17th century, the aldermen were elected in the nave. It suffered the damage caused by several bands of Huguenot, which plundered the bishops of Lyon's tombs, then those of the French Revolution.
After the French Revolution, the church served as flour warehouse. In the late 18th century, the project to transform the church into a gallery was abandoned after a petition signed by 100 notables.
The sacristy was built in 1816, and the organ was installed in 1886.
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.