Thierhaupten Abbey, dedicated to Saints Peter and Paul, was founded in the late 8th century by Duke Tassilo III of Bavaria - the last of the Agilolfings, who was deposed by Charlemagne in 788. Under the Carolingian dynasty, the abbey became a possession of the Augsburg bishops. Its name Thierhaupten, which means 'beasts' heads' in German, is supposed to refer to a heathen shrine formerly on the site, possibly the remnants of a pagan cult place.
The abbey was looted by the Hungarians in 910 and again in 955, when they met with East Frankish troops at the nearby Battle of Lechfeld. It was re-established in 1028 at the behest of Bishop Gebhard II of Regensburg and the abbot of St. Emmeram's Abbey. Thierhaupten received further estates from the hands of the Wittelsbach emperor Louis IV and was vassalized by the dukes of Bavaria-Landshut upon his death. Devastated by the troops of the Swabian League in the course of the 1504 Landshut War of Succession and again in the Schmalkaldic War of 1546/47, it was re-built and prospered, although it always remained a small community. Heavily affected by the Thirty Years' War and the War of the Spanish Succession, it was finally dissolved in 1803 in the course of the secularisation in the Electorate of Bavaria.
The buildings were sold off to a local businessman. The last abbot, Edmund Schmid, remained in Thierhaupten as the parish priest, and succeeded in 1812 in acquiring the former abbey church for use as the parish church. The remaining buildings were preserved, but gradually fell into disrepair, until they were bought by the Thierhaupten municipality administration in 1983 and renovated.
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.