The church of San Giuliano is one of the oldest places of worship in Erice, dedicated to San Giuliano, martyred in 254 AD. Its construction was commissioned, according to tradition, by the Norman Grand Count Roger in the 11th century, but it has been a place of worship already during the first centuries of Christianity. It was rebuilt between 1612 and 1615, more imposing and with three naves. In 1927 it was closed due to a collapse and reopened after almost 80 years in 2005.
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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.