Säckingen Abbey is a former Roman Catholic abbey founded in the 6th or 7th century by Fridolin of Säckingen, an Irish monk. While the Abbey had both monks and nuns, only the nuns' convent grew to be an important religious, economic and cultural institution for the entire upper Rhine.
Little is known about the early history of the Abbey before the 9th century. On 10 February 878, the Emperor Charles the Fat gave his wife Richardis the monasteries of Säckingen, of St. Felix and of Regula in Zurich as a royal estate. This grant included extensive political rights and a large estate, which covered land in the Rhine and Frick valleys, the southern Hotzenwald, and lands in Zurich along Lake Walen and the valley of Glarus.
In 1173 Emperor Frederick Barbarossa granted rights to the Imperial bailiwick of Säckingen Abbey to Count Albert III of Habsburg. This was the foundation for the development of Habsburg territorial sovereignty over Säckingen. In 1307 the abbess of Säckingen was elevated to the rank of Reichsfürst or Imperial Prince. In 1395, the Glarus valley broke away from the Abbey and became independent, yet retained the image of St. Fridolin as the coat of arms of their canton.
Between 1565 and 1575 the Abbey buildings were renovated and expanded. Then, in 1806 the Abbey was closed. On 12 June 1806, representatives of twelve German princes met with Napoleon to form the Confederation of the Rhine. As part of the agreement, the Abbey was closed and all the Abbey's property was transferred to the Grand Duke of Baden.
As of 2010 the buildings are used by the Caritas Catholic charity as a community center.
References:The first written record of church in Danmark locality date back to the year 1291. Close to the church are several stones with a Christian text and cross inscribed. The oldest parts of the present red-brick church are from the 1300s. In the late 1400s the church was enlarged to the appearance it has today. The church has been modified both internally and externally several times, among other things after the fires in 1699 and 1889. There are lot of well-preserved mural paintings in the walls.