The Holy Cross Minster (Heilig-Kreuz-Münster) is the main Catholic church in Schwäbisch Gmünd. It stands on the site of a former, much smaller romanesque church. It took about 500 years to be completed, though not consecutively. Initial construction began around 1325 under the leadership of an unknown master builder on what was left of the previous romanesque church, the towers of which were still standing. In 1497, the south tower fell onto the north tower, which knocked over the north tower after a bow connecting the two was removed and in 1515, all repair work was finished.
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.