The building of Hultaby Castle was begun in the second half of the 13th century and it was inhabited in the middle of the 14th century by the Swedish councillor of the realm and earl of the Orkney Islands, Erengisle Sunesson (Bååt).
Together with the castle itself, which is 28 by 32 metres, the castle area consists of a group of 10 building foundations, which lie in an L-formation on the southern and eastern sides of the castle. There used to be an additional fifteen or so buildings spread out outside the castle area. The upper part of the castle, which consisted of a great room, two minor rooms and a tower, and the surrounding buildings, were of timber.
The castle is thought to have been burnt by Count Henrik of Holstein (known as “Järn Henrik”, Iron Henrik), the bailiff of King Albrecht, during the 1360s, at which time there was civil strife between the rival Swedish kings Magnus Eriksson and Albrecht of Mecklenburg.
The area around the old ruins shows many traces of the old cultivated landscape. Apart from the mounds of stones left by the farming of times past, there also remain plants that are favoured by hay making and grazing, such as leopard’s bane, greater yellow-rattle and common milkwort.
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.