First built in 1064 AD as a Romanesque Basilica of the then Benedictine Kloster Allerheiligen, it was rebuilt several times, and became in 1524 the Reformed Church of the city of Schaffhausen.

The Earls (German: Grafen) von Nellenburg recognized the importance of the geographical area as a transshipment of goods on the Rhine river, and the order to bypass the Rheinfall waterfalls, controlled by the Wörth Castle.

The Allerheiligen Abbey and the Basilica were founded by Eberhard von Nellenburg in 1049, on 22 November it was consecrated by Pope Leo IX, and in 1064 the construction works were completed.

[1] In the so-called Investiture Controversy conflict between the Roman Catholic church in Rome and the secular power, the pope loyal Count Burkhard von Nellenburg, the son and heir of Eberhard, conformed in 1080 all of the rights of the monastery.

The monastery was directly subordinate to the Pope, and received the vast estate of the family, the free election of the abbot, and the mint money market as well as the town of Schaffhausen.

Ebernhard von Nellenburg financed the monastery's church third central tower to the west, extended with a new chancel choir grown in the apex outdoor crypt, as a burial chamber, and a subsequent courtyard.

In the west, the monastery gate, a two-storey house for guests and lay brothers were added, as well as the present herb garden, the hospital, the novitiate and a loggia.

The ornately decorated semi-circular arched lunettes that were originally on this upper chapel, are among the finest examples of Romanesque architectural sculpture in the monastery, and are on display in the museum.

Koppeln: II/I, III/I, III/II, I/P, II/P, III/P – 1) swellable – 2) in separate swell[2] As part of a total restoration of the church (1979 to 1985), the existing organ was obtained as a monument worthy instrument, but at the same the front panel time pushed back.