University of Osuna functioned from 1548 until 1824. The building of the former university is significant both architecturally and for its long history as a seat of the university. Its construction was ordered by Don Juan Téllez Girón, founder of the university. The First Duke of Osuna was responsible for numerous buildings in his domain, nearly all of a religious character. The university building is, therefore, particularly notable as an essentially civil building devoted to education.
The buildings erected under the patronage of the First Duke of Osuna are important primarily because of the adoption and diffusion of new stylistic currents and ideas from the Italian architecture of the time. The Renaissance aspects of the buildings are patent, as is the relation to the ideology of humanism in a building expressly created as a center for modern education.
The surviving university building testifies to the Renaissance aesthetics, providing one of the most singular and defining architectural examples of Osuna's past greatness.
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.