Nidzica castle construction was begun around 1370. The Pfleger of the Teutonic Knights made it his residence in 1409. On 12t July 1410, the undefended castle was captured by the Polish forces on their way into the interior of the State of the Teutonic Order. At the time of the Hunger War of 1414 the castle was put under siege by the Polish knights and taken after eight days on the 6th of July. In 1454 the castle was occupied by the Prussian Union and in February 1455 was taken by the Czech army led by Jan Kolda ze Zampachu, who had repulsed an attack an by the forces of the Teutonic Knights on 28 April.
In 1517 the inner ward was built up and reinforced. In 1784 a fire consumed the innter ward. In 1812 the castle was devastated by French forces. The castle was rebuilt from 1828-1830 into a court and a prison. The Soviet army bombarded the castle in 1945 and it remained in ruins until its rebuilding in 1961-1965.
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.