Wittichen Abbey is a former Poor Clares abbey founded by Saint Luitgard of Wittichen in 1324. According to Luitgard, who came from the Schenkenzell village of Kaltbrunn-Vortal, God said to her on the site of the monastery: 'Here you are to build me a house!' So she searched for other co-sisters and founded her abbey in the outback of Wittichen with 33 sisters.
The abbey found support from the dukes of Teck and the counts of Geroldseck as well as Queen Agnes of Hungary. Through her intervention the retreat was recognised as an abbey by John XXII. It was in 1540 temporarily closed due to the Reformation and again in the Thirty Years' War (the abbey suffered heavy damages in 1640 and 1663. The monastery was secularized in 1803. After that the monastery came into the possession of the Princely House Furstenberg. Part of the buildings were demolished because of the high costs in the 1850s. The church, the nave and the monastery barn have been preserved, as well as the cemetery.
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.