The Cathedral Church, also known as St. John's the Baptist Church, was originally built between 1098 and 1132. It has been almost entirely rebuilt, following the original design, after the earthquake in 1743. Inside one can admire a polychrome mosaic from 1178 and a crown in wood from 1594.
Here Ruggiero, son of Tancredi, was crowned King of Sicily in the year 1191, and in the year 1225 celebrations were held for the marriage of Isabella of Brienne, queen of Jerusalem, to the emperor Federico II.
Valuable paintings of several ages are collected in the chapels, sacristy and altars.
A chapel is dedicated to St.Teodoro's relics, the Saint of the city togheter with Saint Lawrence.
It's located side by side to the cathedral's bell tower, that was completed in 1795; from the other side there are the Bishop's palace and Seminary building, built in 1720 by using the materials obtained from the demolished Basilica of Saint Leucio.
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.