Altomünster Abbey (Kloster Altomünster) was a monastery in the small Bavarian market town of Altomünster. A small monastery was founded here by and named after Saint Alto, a wandering monk, in about 750. Sometime before 1000 the Welfs enlarged it and made it into a Benedictine abbey. Welf I, Duke of Bavaria resettled the monks in 1056 to the newly founded Weingarten Abbey in Altdorf (now also called Weingarten), while the nuns formerly resident at Altdorf moved to Altomünster, where they lived until the monastery was dissolved in 1488 by Pope Innocent VIII.