Santo Tomé el Viejo Church was built outside the walls in the mid-12th century opposite the Gate of El Peso de la Harina (which was opened up in the 16th century when the Gate of El Obispo was closed).
Built in Caleno granite, besides some of its interior elements, it conserves the 12th-century east and south entrances, with their semi-circular arches and archivolts set on columns on the west porch and on the fascia of the capitals to the south; they boast a declaration made up of figurative, plant and geometric motifs. In 1520, the apses were removed from the upper end, together with the arches that separated the naves (replaced by columns forming two large arches on each side) and the layout was reduced to one rectangular nave.
Besides its function as a church, this Romanesque building has had many uses. After the sale of church land ordered by Mendizábal, it became a private building and was used as a garage and petrol station until 1960, when it was acquired by the State. It was designated a National Monument in 1963. It is currently an annex of the Provincial Museum and is used as a storage area for stone archaeological items; it is also open to the general public.
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.