All Saints Church is surrounded by a castle-wall-type barrier - by the wall of the former cemetery. The residents of the valley of the Tettye river built a one-navy church here as early as the 13th century. The originally Romanesque style All Saints Church was reconstructed in the 15th century in Gothic style. The exterior is simple, while a short tower stands on the triangular pediment of the main façade. The interior is mostly 18th century Baroques style. During the Turkish occupation this was the only church that still belonged to the Christians. It was used jointly by Catholics, Calvinists and Unitarians. This is where the famous religious dispute of the Calvinist Máté Skaricza and the Unitarian György Válaszúti took place in 1588.
The church became Unitarian by the mid-17th century, the Catholics only managed to regain it in 1664. Following this period, it was under Jesuit management until 1704. At this time it was reconstructed to be a three-nave church, this is when the little tower was added. On the south side of the cemetery, protected by stone wall, 18th-19th century graves, on the north, Baroques graves can be found.
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.