Altmünster Abbey was a Benedictine monastery on the Plateau Altmünster, between the Fishmarket and Clausen areas of Luxembourg City.
It founded in 1083 by Conrad I, Count of Luxembourg as a private monastery and a religious centre of his county. The monks came from the abbeys of Saint-Airy and Saint-Vanne in Verdun. Conrad's son, Count William, dedicated the abbey to Our Lady (Notre Dame) in 1123, but to locals it continued to be known as Mënster (German: Münster, meaning a monastery church or any large church building). In this period, the monastery was also put directly under the control of the Pope, so that neither Saint-Vanne nor the secular authorities could interfere with it.
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