Tsikhisdziri is home to an archaeological site and ruins of a Late Antique fortified town, which is identified with the Roman-built city-fortress of Petra.
Petra, founded at the behest of the emperor Justinian I in 535 and, after a series of battles for the possession of that city during the Lazic War with Sasanid Iran, was demolished by the Romans themselves to prevent it again becoming the enemy's target in 551. Later, the locale continued to be home to a stronghold of some importance.
The Tsikhisdziri fortress was situated on two coastal hills, connected to each other through double walls. On the territory of the citadel, the area of which totals around 1.5 h, are the ruins of a 6th-century three-nave basilica with the dimensions of 33X17.80 m, with narthex, projecting apse, and floor mosaic, and remains of two other churches, one from the early Christian period and the other dated to the High Middle Ages. Close to the basilica is a 6th-century bath and a water cistern. North to the citadel are the ruins of an urban settlement and hundreds of burials. These structures date from the Late Antiquity to the Middle Ages.
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.