In 840 the monastery burnt down and the request of the monks for funds for its re-building, addressed to Otkar, Archbishop of Mainz, previously abbot of Klingenmünster, constitutes the first direct documentary evidence.

[2] In the 11th century a monk of Klingenmünster, Gottschalk, brought the abbey to prominence by his appointment as notary to Emperor Henry IV in the Imperial chancery between 1071 and 1084.

In 1115 Adalbert I, Archbishop-Elector of Mainz (and brother of Frederick, Count of Saarbrücken), freed the abbey of all royal, episcopal and advocatial services and impositions.

It now served as a place of accommodation for the younger sons of the local nobility, and by the latter half of the 15th century had lost any semblance of discipline or adherence to any Rule.

It suffered considerable loss in the time of Johann, the third prior (from 1499 to 1506) from a Bavarian feud and the Landshut War of Succession, and in order to stave off financial ruin much of its remaining property had to be mortgaged.