The construction of the Habsburg imperial and royal parish of St. Michael began in the Romanesque period around 1200. The first year of construction is confirmed by three entrance arches dating back to the years 1220-1250.In the period between 1340 and 1450 the Gothic annexes were built. The cross chapel is the prime example of this epoch. From the middle of the 16th century, the crypt of St. Michael, known as Michaelergruft, was known and used as a burial place instead of the cemetery until 1784. Numerous coffins and gravestones still prove this. Guided tours are available.In the course of the Counter-Reformation St. Michael was entrusted to Barnabite Order in 1626. The order, also known as the Order of Saint Paul, originated from the monastery of St. Barnabas in Milan. The choir barrier and almost the entire interior have been removed. In addition to new altars, the Sieber organ was built in 1714.