The abbey was founded in 1080–1082 by
Ottokar II of Styria as a community of secular canons and as a dynastic burial place for his family. Together with his fortress, the Styraburg (Schloss Lemberg), it served as a focal point of Ottokar as ruler of the
Traungau, and was endowed with significant possessions in the
Traisen and
Gölsen valleys, in
Lower Austria, probably from the dowry of Ottokar's wife Elisabeth, daughter of the
Babenberger Leopold II of Austria. In 1107–1108 the monastery was made a priory of the Benedictine
Göttweig Abbey; and became an independent abbey in 1110–1111. Its first and greatest abbot was Blessed
Berthold of Garsten (d. 1142), a champion of the
Hirsau Reforms, who is buried in the abbey church, and who built the abbey up to such a level that for centuries it was the religious, spiritual and cultural centre of the Eisenwurzen region. Monks from Garsten settled
Gleink Abbey in the 1120s. From 1625 Garsten Abbey was a member of the Benedictine
Austrian Congregation. In 1787 it was dissolved by Emperor
Joseph II. ==Abbey church==