The 'Old Church' of Diekirch with its two naves in Gothic style, dates back to 1467. In the Merovingian period (6th and 7th centuries), a pre-Romanesque church was built in the place of a Gallo-Roman sanctuary, certain parts of whose walls are still visible today. In the 11th century, this building was replaced by a Romanesque church, whose tour has been kept (12th century). Inside, the church has fine frescoes dating from the 16th and 17th centuries. In 1960, a cemetery, probably from the Merovingian period, was discovered underneath the church.
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.