St. Michael's Church (German: "Michaelerkirche") is a Roman Catholic church and one of the oldest churches in Vienna. It is near the Hofburg Palace, the palace of the Holy Roman Emperors. St. Michael's was the parish church of the Habsburg rulers and their families.

It was built between 1220 and 1240 in the Romanesque style. The altar room was built between 1327 and 1340 and the lower parts of the tower later. Subsequently, the church was rebuilt and it has stood in its present form since 1792 when its façade was changed to a neo-classical style by Ernest Koch, a typical style for the reign of Emperor Joseph II.

Above the entrance, on top of the pediment, resting on Doric columns by Antonio Beduzzi, stands a group with winged angels and St. Michael slaying Lucifer (1725). These sculptural figures were executed by Lorenzo Mattielli, (1688-1748) who also sculpted the Hercules figures at the Hofburg entrance, just opposite the church. The steeple was added in the 16th century. The high polygonal Gothic bell tower from the 16th century has become one of the symbols of the Inner City.

The crypt beneath the church has special climatic conditions to ensure that the bodies interred there do not decompose. Around 4,000 people were laid to rest here from 1631 to 1784.

The church has a very large pipe organ and parts are covered with sheets of gold. In 1791, excerpts of Mozart's "Requiem" were performed for the very first time there, not long after his death.

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