The Roman walls of Astorga were built at the end of the 3rd century AD or beginning of the next century. The reasons that caused its construction are related to a period of instability experienced in the last years of the Roman Empire, especially originated by the incursions of the barbarian towns from the center of Europe. The walls has a length of 2,2 km.
At the end of the thirteenth century, repairs were documented by the hand of Bishop Nuño, who is credited with an important building task in the city of Astorga. However, we do not know the scope of these contributions, which may have significantly altered the appearance of Roman fortification.
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.