Despite remains of prehistorical settlements and legends of a Roman foundation, the first mention of Militello dates from 1000 AD, when it became a marquisate under the Cammarana. The golden age of Militello was during the early 17th century, under the government of Prince Francesco Branciforte. The city was destroyed by an earthquake in 1693, but the subsequent restoration added numerous architectural and artistic works of art.
Together with other cities of the Val di Noto, Militello has been inscribed in the UNESCO World Heritage Sites List as one of the Late Baroque Towns of the Val di Noto.
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.