It was founded and endowed in 1024 by Pfalzgraf Ezzo, count palatine of Lotharingia of the Ezzonian dynasty and his wife Matilda of Saxony, a daughter of Emperor Otto II and Theophano. Ezzo and Matilda were buried here, as were their two eldest sons Liudolf, Count Palatine of Lotharingia (d. 1031) and Otto II, Duke of Swabia (d. 1047). From 1065 until his death in 1091 Wolfhelm of Brauweiler, later Saint Wolfhelm, was abbot here. His relics were enshrined in the abbey church, and miracles were reported at his tomb, but all traces of them were lost centuries ago.