According to legend, it was founded after Duke Tassilo III of Bavaria, while hunting nearby, had a vision of three springs, which his servant Wezzo duly discovered the next day.
In 788 Wessobrunn became a Carolingian Empire Imperial abbey (i.e., independent of other terrorial lordships and answerable only to the monarchy) In about 900 it became a property of the Bishop of Augsburg.
In 955 the abbey was destroyed by the Hungarians, on which occasion Abbot Thiente and six of his monks suffered martyrdom, while the remaining three fled to Andechs with the sacred relics.
Adalbero was succeeded by Sigihard (1110–28), during whose reign a separate church was built for the people of the surrounding area, dedicated to Saint John the Baptist in 1128.
A new era of great prosperity began with the accession of Ulrich Stocklin (1438–43), who had previously been a monk at Tegernsee Abbey and acquired considerable fame as a writer of sacred hymns.
From the 16th century to the secularisation of Wessobrunn in 1803, its monks displayed a continuous rare literary activity and some of them acquired fame as authors and teachers in various schools of Germany.