The Chiesa degli Ottimati history is documented as early as the 10th century. The present name derives from a Norman confraternity that rebuilt the church, and dedicated it to the Virgin of the Annunciation. The Ottimati were a congregation of nobles founded by the Normans. Over time, these included the Filocamo, Griso, Altavilla and Borboni.
The original layout appears to have been a Greek cross, with multiple domes. The Normans under Roger II, built a church on top, eliminating many of the domes. On September 3, 1594 the church was damaged and burned during a sack of the town by Saracen raiders. In 1597, the church commissioned a new painting of the Annunciation by Agostino Ciampelli.
By the 18th century, the church was affiliated with the Jesuits, and a school was adjacent. With the suppression of the Jesuits in 1767, the church fell empty. It was damaged by earthquakes in 1783 and 1908. The church rebuilt after 1908 moved from the original location, and was completed in 1933, using a design by Pompilio Seno, who adopted a neo-Byzantine style with Arab-Norman elements. Some elements from the destroyed Norman basilica of Santa Maria di Terreti were used.
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.