Tauresium is an archaeological site in North Macedonia, best known as the birthplace of Byzantine Emperor Justinian I (ca. 482) and King Theodahad of the Ostrogoths (480).
Tauresium and the castle Baderiana were destroyed in an earthquake in 518 and the epicentre of the earthquake was in the nearby city of Skupi. As a gesture of gratitude to his birthplace, Justinian I rebuilt the city. According to the excavations that have been done so far, it is estimated that the oldest parts of Tauresium date from the 4th century and this oldest part is a castle with four towers known as Tetrapirgia.
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.