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The monastery, dedicated to Saints Peter and Paul, was founded in the late 8th century by Duke Tassilo III of Bavaria - the last of the Agilolfings, who was deposed by Charlemagne in 788.
According to Eginhard's brief description, the commendatio made to Pippin the Younger in 757 by Tassillo, Duke of Bavaria, involved the relics of Saints Denis, Rusticus, and Éleuthère, Saint Martin, and Saint Germain, which had apparently been assembled at Compiègne for the event.