Between 1350 and 1360 Ortolf von Trier, a knight of the Teutonic Order and the Komtur of Elbląg, founded a fort in Galindia, probably near an Old Prussian settlement. The first mentioning of the fort was a document from 24 September 1360, after Ortolf invited Masoviancolonists, among whom the settlement became known as Szczytno. The first custodian of the settlement was Heinrich Murer. In 1370 the wooden fort was destroyed byLithuanians led by Kęstutis, after which it was rebuilt using stone. The name Ortulfsburg gradually changed into Ortelsburg. The settlement grew in size owing to its location on a trade route from Warsaw to Königsberg (now Kaliningrad).
The castle was occupied by Polish troops during the Thirteen Years' War. With its inclusion in the Duchy of Prussia in 1525, it lost its importance as a border fortress and began to decline. Margrave and regent George Frederick (1577–1603), who enjoyed hunting nearby, began the redevelopment of the area. Among his projects was the rebuilding of the castle into a hunting lodge.
Ortelsburg became the seat of Landkreis Ortelsburg, one of the largest in East Prussia, in 1818 after Prussian administrative reforms, with Ritter von Berg chosen as the first district administrator. It was almost completely destroyed on 30 August 1914 at the beginning of World War I by troops of the Russian Empire, with 160 houses and 321 commercial buildings burning down.
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.