Church of Our Lady Assumed into Heaven in Ostrzeszów is a late-gothic parish church, founded by King Casimir the Great in mid-14th century. It was initially composed of presbytery and a sacristry. The nave was added in 1360. After the destruction by a fire of the late 15th century and by the Swedish invasion in mid-17th century, the church was rebuilt in 1721–1723. Gothic-style stained-glass windows were fixed in 1939.
The church’s altars are baroque in style – the main one containing a copy of The Assumption of Our Lady by the famous Spanish painter Murillo. The chancel arch features limewood sculptures, probably made by Albrecht Dürer.
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.