The steep plateau of Saint-Blaise oppidum is accessible only from the south, therefore easy to defend, was inhabited from the Neolithic until the end of the 14th century with a long interruption during the High Roman Empire (from the 1st to the beginning of the 4th century AD). The excavations undertaken by Henri Rolland in 1935 and continued after his death, have brought to light eight archaeological layers.
There are today remains of Hellenistic rampart (2nd century BC), surmounted by the early Christian walls, a Christian necropolis, and foundations of 11th century church. The Chapelle St-Blaise is a 12th century Romanesque building, restored in the 13th century and whose facade was redone in 1608.
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.