According to legend, Valperga Castle was founded during the second half of the 10th century by Dadone, father of King Arduino. The hamlet's fortresses, which date back to the 14th century - a period of major conflict between the Valperga family and the San Martino family, were renovated in the 16th century. But the structure of the fortress changed during the 17th century when the people, brought to their knees from conflict and dying of hunger, took possession of the walls and turned the ditches into fields for farming. It was Cristina di Francia, the unbendable Madama Reale, who put a stop to that and ordered that the walls be cleaned. The original shelter, partially preserved, has the residential rooms which were once used to stockpile food. When, during the second half of the 18th century, the Baron Carlo Giuseppe Coardi di Carpeneto became the owner of the fortress, he had a new wing built next to the original structure. This building, remodeled beginning in 1807, has, overtime, taken on the look of a Neo-Classical villa and is today, a retirement home for the elderly.
A tower with a rectangular layout that forms the entrance and the circular towers in the central body are what remain of the oldest part of the castle.
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.