The Piarist Church, also called Maria Treu, is a Baroque Catholic parish church of the Piarist order in Vienna's Josefstadt district. Johann Lukas von Hildebrandt and Mathias Gerl are credited as architects. Construction began in 1698, the church was consecrated in 1719 and it was completed in 1753. It was raised to the rank of Basilica Minor in 1949.
It is about 180 feet (55 meters) long and 131 feet (40 meters) wide, with a nave 49 feet (15 meters) wide. It has six chapels, and Franz Anton Maulbertsch painted its frescoes in 1752 and 1753.
Haydn's Missa in Tempore Belli, known as the Paukenmesse, was commissioned by the Piarists and premiered here on December 26, 1796. It remains an active parish church.
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