Otepää castle hill is the site of an ancient stronghold. It is speculated that a fortified settlement may have existed there even before Christ. The first major extension works were initiated in the 11th and 12th century when the castle was at the crossroads of important trading routes. Herman I, the bishop of Tartu, established there the first stronghold of its diocese. A settlement, which was mainly populated by craftsmen and merchants, appeared around the bishop’s castle in the 13th century. The castle was the first known brick building in Estonia.
References: VisitEstonia, turismiweb.ee
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.