Count Nikolaus "Miklós" of Esterházy (1583–1645), palatine of Hungary, made a lot of efforts to win his relative and neighbour Franz III.

After visiting Italy and meeting with Fr Nicholas Donellan,[2] an Augustinian from Vienna, the 22-year-old Nádasdy publicly declared his conversion to Catholicism on Nov. 25, 1643 in the church of Csepreg, setting in the Catholic restoration in his estates.

A painting by Georg Kiery of Güns, created in 1675, is located at the high altar; it depicts the church's two patron saints.

[4] In 2003, a new organ was installed; the largest in the region,[7] it has 2400 pipes that range from 8 millimetres (0.31 in) to 4 metres (13 ft) in height.

[5] A large crypt is situated beneath the nave, the final resting place of the Nádasdy and Drašković families.

The crypt contains red marble tombs belonging to the Nádasdy family,[6] the sarcophagus of Franz III.