The city's name derives from the Arabic 'qal'at-al-jarar' ('Castle of jars') – a name that attests to the antiquity of the pottery works which are still thriving. It has been inhabited since prehistoric times, as shown by the presence of two necropoleis dating from the second millennium BCE and by numerous other archaeological finds. It was later inhabited by the Sicels pre-Roman population.
The Arabs built a castle here that in 1030 was attacked by Ligurian troops under the Byzantine general George Maniakes, who have left traces of Ligurian language in the current dialect. The city flourished under the Norman and Hohenstaufen domination, becoming a renowned center for production of ceramics.
Caltagirone was almost completely destroyed by the earthquake of 1693. Many public and private buildings have then been reconstructed in earthquake Baroque style. Primarily for this reason the city has been included, together with the surrounding territory, in an area protected by the UNESCO World Heritage program.
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.