[2] The church, begun in 1440 on the west side of the castle, was commissioned from the architect Peter von Pusica by Frederick III, Holy Roman Emperor.

At the end of the work the church was dedicated to St. Mary and consecrated in 1460.

After the abolition of this chivalric order in 1600, the church was entrusted first to the Cistercians and later the Piarists.

In 1608 and 1616 two fires damaged the castle and the church, which were repaired by initiative of Maximilian III.

[4] Since 1963 the church has been home to the Military Ordinariate of Austria, as a result of which it was elevated to the status of cathedral.