Khertvisi is one of the oldest fortresses in Georgia and was functional throughout the Georgian feudal period. It was first built in the 2nd century BC. The church was built in 985, and the present walls were built in 1354. As the legend says, Khertvisi was destroyed by Alexander the Great.
In the 10th-11th centuries it was the center of Meskheti region. During the 12th century it became a town. In the 13th century Mongols destroyed it and until the 15th century it lost its power. In the 15th century it was owned by Meskheti landlords from Jakeli family. In the 16th century the southern region of Georgia was invaded by Turks. During next 300 years they have owned Khertvisi too.
At the end of the 19th century Georgian and Russian army returned the lost territories and Khertvisi became the military base for Russian and Georgian troops. Khertvisi fortress is situated on the high rocky hill in the narrow canyon at the confluence of the Mtkvari and Paravani Rivers.
References: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.