The Church of St. Leodegar was built in parts from 1633 to 1639 on the foundation of the Roman basilica which had burnt in 1633. This church was one of the few built north of the Alps during the Thirty Years War and one of the largest and art history rich churches of the German late renaissance period.
In the 8th century there was already an abbey consecrated to Saint Maurice on the current site of the church, which had been donated by Pepin the Short, and was known at the time as the Monastarium Luciaria. By the 12th century the abbey was under the jurisdiction of the Murbach Abbey, whose patron saint was St. Leodegar.
In 1291 the abbey was sold to the Habsburgs. In 1433 the city of Lucerne, no longer a member of the Eidgenossenschaft, took control of the abbey, and in 1455 it was converted from Benedictine to a “universal order” church.
The monastery experienced a heyday during the time of the reformation due to Luzern being a prominent city for the Swiss Catholic cantons. The papal nuncio, resident in Luzern, used the church as his cathedral during this time.
In 1874 the parish church of St. Leodegar was founded and with that the church became simultaneously a monastery church and parish church, as it is today.
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.