Altenburg Abbey was founded in 1144 by Countess Hildeburg of Poigen-Rebgau. Archeological excavations carried out by the
Federal Monuments Office between 1983 and 2005 have revealed evidence of its dating in the remains of a wall from the 12th century and of a Romanesque cloister dated to the 13th century. The monastery was destroyed and reconstructed as a result of numerous attacks. The first was in 1251 by
Hermann V von Baden, followed by several by the
Cumans between 1304 and 1327 and during the
Hussite Wars from 1427 to 1430. It was attacked by Bohemia, Moravia and Hungary in 1448, and by the Turks in 1552. In 1327, some restoration work was carried out by Gertrude, the widow of Heidenreich von Gars. In 1645, the Swedes destroyed the abbey. Refurbishment took shape after the
Thirty Years' War in the 17th and 18th centuries. The abbey took its present form in the Baroque style under the abbots Maurus Boxler and Placidus Much. Work was carried out under the supervision of the architect
Josef Munggenast who was assisted by some of Austria's most distinguished artists and craftsmen:
Paul Troger for the frescoes, Franz Josef Holzinger for the stucco work, and Johann Georg Hoppl for the marbling. Under Emperor
Joseph II in 1793 the abbey was forbidden to accept new novices, but unlike many others in Austria it succeeded in remaining functional. Subsequent to the
Revolution of 1848, its debts were cleared by the sale of some of the chapel's major artifacts. On 12 March 1938, Abbot Ambros Minarz refused to fly the Nazi's
Swastika flag at the abbey which resulted in its occupation by the
Sturmabteilung (a paramilitary organization of the Nazis SA) from 17 March 1938. For a brief period between 1940 and 1941 under the
National Socialists the abbey was suspended, and in 1941 dissolved. The abbot was placed under arrest and the community dispossessed. From 1945 the premises were used as accommodation by
Soviet occupying troops. Under Abbot Maurus Knappek (1947–1968) the buildings were restored and the community re-established. Since 1625, the abbey has been a member of the
Austrian Congregation now within the
Benedictine Confederation. Archeological excavations carried out in the chapel have revealed a medieval "monastery beneath the monastery". The finds include a refectory, a chapter house, the monks' working and living quarters, a cloister, a scriptorium, and a Gothic St. Vitus Chapel. ==Layout plan==