Mechtildis was the daughter of Count Berthold of Andechs, whose wife, Sophie, founded a monastery on their estate at Diessen, Bavaria, and placed their daughter there at the age of five.

[1] In 1153, the Bishop of Augsburg placed her as Abbess of Edelstetten Abbey.

Her adorned remains lie in a glass shrine within the Marienmünster church of that town.

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