The first written mention of the castle in Olomouc is included in the Cosmas Chronicle in 1055. The king Wenceslas III, the last Přemyslid, also stayed at the castle and was assassinated here in 1306. In 1767 the young Mozart stayed in the house of the Chapter Provost on the castle grounds and composed Symphony No. 6 in F major here. Some of the recent celebrities who have visited the site are Mother Theresa or Pope John Paul II.
After being partially damaged during the Thirty Years’ War, the medieval castle grounds were reconstructed in the Baroque style over a period of almost one century. Today, there remains little visible evidence of the significance and power of this castle. As time went on, the castle was overbuilt with religious buildings and the Wenceslas cathedral.
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.