The monastery was founded in 1112 by Ulrich I, Bishop of Passau, at St. Georgen an der Traisen, now in Traismauer, at the confluence of the Traisen with the Danube. In 1244 because of frequent flooding it was moved up-river towards Herzogenburg. From 1714 the buildings were refurbished in the Baroque style by Jakob Prandtauer, Johann Bernhard Fischer von Erlach and Josef Munggenast. The monastery was able to survive the dissolutions enforced by Emperor Joseph II in the late 18th century. Until 1783 the monastery was in the Diocese of Passau, afterwards in the Diocese of St. Pölten.