Basílica de Santa Eulalia may have been the first Christian temple erected to Spain after Christianization of Roman empire. It was dedicated to Eulalia of Mérida, a young Roman Christian martyred in Augusta Emerita in 304 AD. The current church was built in the 13th century after it has been conquered by Christians during Reconquista.
Basilica contains collection of tombs of very distinct periods, oldest the considerably big, late-Roman mausoleums.
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.