The remains of the Roman town of Regina Turdulorum, found near the municipality of Casas de Reina in Badajoz province, form an extremely interesting ensemble, in a perfect state of preservation, with the forum and a 1st century AD theatre as its most remarkable features.
The Roman theatre was built in the age of the Flavian emperors, could seat one thousand spectators and was operational until the 4th century AD.
Meanwhile Regina's Roman forum preserves the foundations of some houses, civil buildings, porticoes and the odd remnants of paving or Roman road that transport you directly to this period of history. A porticoed templum with a small room dedicated to the worship of the emperor and the imperial house has also been recovered through different excavations, alongside which other buildings must have existed, such as the market and the basilica.
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.