Set on a hilltop surrounded by vineyards and cypresses, the Gallo-Roman villa of Séviac was a luxurious residence, spread over almost 6500m2. It is today one of the largest Gallo-Roman villas known in the south-west of France. The villa was built in the 2nd century AD and reconstructed in the 3rd and 4th centuries. Later in the 8th and 9th centuries the place was used for a church, burials and necropolis. The villa is distinguished by its exceptional set of Roman age mosaics (over 625m2) and vast baths.
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.