The Ourense Provincial Archaeological Museum occupies the building that was the Bishop’s Palace. It is one of the best preserved civil monumental ensembles in Romanesque style, and was declared a Historic-Artistic Monument in 1931. Its structure is a faithful testimony of the development of the city, with Roman, Gothic, Renaissance, Baroque and modern elements. Its construction began in the 12th century and played an important role in the medieval urban organization.
The site was already occupied in Roman times, as evidenced by the discovered building remains, and subsequently by a high-medieval necropolis.
The present building was built in the 12th century, and its main façade is now, after many reforms in the surroundings, a Romanesque courtyard. Over the centuries it underwent modifications and extensions that altered its general appearance. So, the added elements are Gothic (tower of Santa Maria), Renaissance (garden galleries), Baroque (the main entrance) and modern (arcades in Bispo Carrascosa street).
The Archaeological Museum, founded in 1895, finally settled in this building in 1951, undergoing a restoration, according to a project by Pons Sorolla in 1960-1968.
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.