Piaristenkirche Maria Treu in Wien
The Baroque Piarist Church of Maria Treu is a parish church and the church of the Order of the Piarists (Patres Scholarum Piarum) in Vienna. It is located in Vienna's 8th district (Josefstadt). The Piaristenkirche has been elevated to the rank of Basilica Minor in 1949.
The church has eight chapels and is decorated with frescoes made by Franz Anton Maulbertsch in 1752–53.
Commissioned by the Piarists, the Haydn’s Missa in Tempore Belli (Mass in Time of War, sometimes known as the Paukenmesse, or Kettledrum Mass) was first performed on 26 December 1796.