The church of Saints Julián and Basilisa was originally built in the late twelfth century. Two inscriptions are provided, one, on the west window of the portico, dates the work to 1186 and names the sculptor Juan de Piasca, and the other on the baptismal font, states its creation date of 1195. In the sixteenth century, however, the building was heavily reconstructed, leaving only the portico generally intact, albeit walled in. It remained enclosed until the building's modern restoration in 1928. The portico is heavily decorated, including a row of figural and vegetal capitals sculpted in the round, a carved alfiz, and numerous corbels.
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.