Oponice Castle was probably built in the second half of the 13th century by son Peter from the Csák clan. The castle was first mentioned in 1300 as 'Oponh'. Until the death of Máte Csák of Trencsén in 1321, Oponice Castle guarded part of his wide domain in the central Nitra area. The castle was later administered by the royal exchequer until it was passed in 1392 into the hereditary possession of Nicholas Ewres, founder of the Apponyi dynasty.
The castle was expanded and its defenses strengthened, particularly during the threat from Ottoman Turkey, allowing it to withstand enemy onslaughts. Unfortunately, a family dispute over land dating from 1612 meant the end of the castle, punctuated by a fire in 1645 which caused the castle owners to finally abandon it. From time to time the castle was used by the Kurucs, Hungarian insurgents fighting the Habsburgs, until Imperial forces conquered it and had the castle demolished in the early 17th century. The castle's aristocratic tradition remained bound to the Apponyis, who maintained and preserved it until the death of the final descendant from this family, Henrich Apponyi, in 1935.
The castle’s distinct silhouette covers the preserved gun bastion and northeast Renaissance castle up to the third floor.
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.