The 11th century wooden stronghold of Racibórz was rebuilt as a brick castle in the third quarter of the 13th century. Around 1290 a chapel was built in the castle with the significant dedication of Saint Thomas of Canterbury.
At present, its most valuable element is the castle chapel, due to its high artistic level called the pearl of Silesian gothic. Fortunately, the reconstructions from the seventeenth and nineteenth centuries did not manage to change its Gothic interior, and the 19th-century matroneum placed on the site of the medieval one, neatly imitates the likely appearance of the original. The gables, western entrance portal and vault in the western bay of the chapel have also been transformed. Next to it is the palace wing. Recently renovated it is a place of cultural and entertainment events and a small museum.
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.