Elchingen Abbey was a Benedictine monastery in Oberelchingen. For much of its history, Elchingen was one of the 40-odd self-ruling imperial abbeys of the Holy Roman Empire and, as such, was a virtually independent state that contained several villages aside from the monastery itself. At the time of its secularisation in 1802, the abbey covered 112 square kilometers and had 4000-4200 subjects.
Dedicated to the Virgin Mary and Saints Peter and Paul, the monastery was founded by the Counts of Dillingen in 1128. The abbey was one of the very few that enjoyed Imperial immediacy (independent of the jurisdiction of any lord and answering directly to the Holy Roman Emperor, and thus a territorial principality in its own right). The abbot sat in the Reichstag of the Holy Roman Empire.
Like all the other imperial abbeys, Elchingen lost its independence in the course of the secularisation process in 1802-1803 and the monastery was dissolved. By 1840 the buildings had been almost entirely demolished. In 1921 the Missionary Oblates of Mary Immaculate settled on the site. Today the abbey church remains.
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.