St. Thomas Church is associated with a number of well-known composers such as Richard Wagner and Felix Mendelssohn Bartholdy, but mostly with Johann Sebastian Bach who worked here as a Kapellmeister (music director) from 1723 until his death in 1750. Today, the church also holds his remains. Martin Luther preached here in 1539.
There has been a church at the current site of the Thomaskirche at least since the 12th century. Foundations of a Romanesque building have been discovered in the choir and crossing of the current church. Between 1212 and 1222 the earlier structure became the church of the new St. Thomas Monastery (Stift) of the Augustinian order.
The current building was consecrated by Thilo of Trotha, the Bishop of Merseburg, on 10 April 1496. The reformer Martin Luther preached here on Pentecost Sunday in 1539. The monastic buildings were demolished in 1541 following the monastery's dissolution. The current church tower was first built in 1537 and rebuilt in 1702. Chapels added in the 17th century and an ante-building along the northern front of the nave with two stairways were removed at the end of the 19th century.
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.