The Katskhi Monastery of Nativity of the Savior was built at the behest of the Baguashi family in the period of 988–1014. The church building is noted for a hexagonal design and rich ornamentation. Closed down by the Soviet government in 1924, the monastery was revived in 1990 and is now operated by the Eparchy of Sachkhere and Chiatura of the Georgian Orthodox Church.
The Katskhi monastery is a octagonal building of more complex design than other similar polygonal Georgian monuments. The exterior of the church features three gradually narrowing cylindrical levels formed by the faceted gallery, the main body of the church, and the drum of the dome.
The six apses are inscribed into the outer polyhedron and surrounded by an ambulatory from all sides. A single spacious interior compartment around the subdome bay includes radially oriented semi-circular apses. One of these, the altar apse, projects outward prominently due to its large bema. The drum of the dome is also faceted. Each facet of the main body of the church as well as that of the dome and gallery terminate in a pediment with three lines of polygonal cornices.
The building was richly ornated, but the decoration of two upper tiers was lost in the process of the 1854 restoration. Of note is a large composition in relief at the southern vestibule of the gallery, the Exaltation of the Holy Cross, featuring a cross supported by four angels.
The church is surrounded by a pentagonal wall, which contains a free-standing bell tower in its eastern corner. These structures are later additions, probably from the 17th or 18th century.
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The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.