 Today the Reformed church is as before architecturally integrated in the vast complex of the former Allerheiligen abbey, and is located at the center of the historic old city of the municipality of Schaffhausen in the Canton of Schaffhausen.The development of the city of Schaffhausen is closely linked to the "Nellenburg" noble family around 1100 AD.Various archaeological finds and the building of the present church date back to around 1000 AD.