Église Saint-Vincent-de-Paul was built on a demolished convent and chapel of Reformed Augustinians, which explains why it is commonly known as 'Les Réformés' despite being a Roman Catholic church. The church building itself was designed by the architect François Reybaud and the abbey Joseph-Guillaume Pougnet, and built from 1855 to 1886. It is neogothic, with ogival curbs in the ceiling. The two arrows are 70 metre high.
The bronze gates were designed by Caras-Latour, the high altar was designed by Jules Cantini (1826-1916), and the stained windows were designed by Édouard Didron (1836-1902). Additionally, sculptor Louis Botinelly (1883-1962) designed the statues of Joan of Arc and of Jesus. As for the organ pipes, they were made by Joseph Merklin (1819–1905).
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.