The history of Sölvesborg Castle dates at least from the 13th century. In 1263 Valdemar Braunschweig was the lord of Blekinge and Sölvesborg. In the early 15th century the castle was a temporary residence of Queen Margaret and King Erik Pomeranian. During the Northern Seven Years' War (1563–1570) the castle was destroyed by Swedish army. The castle was not rebuilt after that. Current manor house, called Corps de logi, was built to the site in 1800s.
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.