The abbatial complex of the Saint Eufemia was founded by Robert Guiscard in the second half of the 11th century in the place of an ancient Byzantine monastery. Present archaeological investigations concern the church, with the focus on the area of the great presbytery and the main apse. In this part, 3-4 m deeper than the ground level (that has risen in time due to the frequent floods of the Bagni river) a polychromatic tessellated marble pavement decorated with geometric patterns of Norman origins was located. In the same site, the outer walls and the pillars supporting the barrel roof were also discovered. The remains of the altar, deprived of marble covering, stand on a raised marble rectangular tribune, in the center of the apse. The semicircular part of the main apse lies under the local road passing near the church.
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.