The Magnuskirche is a small church in Worms, to the south of Worms Cathedral. It is the city's smallest church. Archaeological evidence and its dedication (probably identifiable with Magnus of Füssen, a Carolingian saint) suggest it originated in the 8th century - part of that building survives in the nave's north wall.
The first written record dates to 1141. It was enlarged many times between the 10th and 15th centuries and during that era served as the nearby Andreasstift's parish church. It is the oldest Lutheran church in south-west Germany, since Martin Luther stayed in it and preached in it during the 1520 Diet of Worms. After the severe damage to the city in 1689 during the Nine Years' War, the church was restored in the Baroque style in 1756. It was destroyed by Allied bombing on 21 February 1945 and restored again in 1953.
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.