Kollmitz Castle is a ruined castle east of Raabs an der Thaya in Lower Austria. The castle was first mentioned in the 13th century and the construction of its main tower was completed in 1319.
In the 14th century the castle was used as a district court with ownership changing often. In 1411 the Freiherr von Hofkirchen came into possession of the castle, whose family would control the castle for the next two centuries. The Hofkirchen family lost possession of the castle in 1611 when Wolfgang von Hofkirchen died in exile in Prague during the Habsburg’s Counter Reformation, which saw him as a ringleader of Protestant nobility.
Following the end of Hofkirchen control, the castle changed hands several times and may even have been abandoned. In 1708 the Castle was acquired by Franz Anton von Quarient und Raal under whom the castle fell into disrepair as it no longer could serve any practical purpose.
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.