The Church of Most Holy Saviour (Santissimo Salvatore) was built starting in 1682 in the area of an ancient female Basilian monastery founded by Robert Guiscard in 1072. The building was designed by the architect Paolo Amato, but also Giacomo Amato and Angelo Italia were involved in the construction.
It was said that Constance, Queen of Sicily (1154-1198) had been confined to the church as a nun since childhood due to the prediction that 'her marriage would destroy Sicily' before 30 when she was eventually engaged for political reason.
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.