|Imperial Abbey of the Holy Roman Empire|
|Languages||Swabian German; Latin|
|-||Founder||William of Hirsau|
|-||ca 1065–90 (First abbot)||Noker von Zwiefalten|
|-||18th century||Augustin Stegmüller|
|Historical era||Middle Ages|
|-||Raised to Reichsabtei||1750|
|-||Secularised and dissolved||November 25, 1802 1802|
|-||Collapse of HRE||July 12, 1806|
Zwiefalten Abbey (in German Kloster Zwiefalten, Abtei Zwiefalten or after 1750, Reichsabtei Zwiefalten) was a Benedictine monastery situated at Zwiefalten near Reutlingen in Baden-Württemberg in Germany.
The monastery was founded in 1089 at the time of the Investiture Controversy by Counts Gero and Kuno of Achalm, advised by Bishop Adalbero of Würzburg and Abbot William of Hirsau. The first monks were also from Hirsau Abbey, home of the Hirsau Reforms (under the influence of the Cluniac reforms), which strongly influenced the new foundation.
The abbey was plundered in 1525 during the Peasants' War.
In 1750 the abbey was granted the status of "Reichsabtei", which meant that it had the status of an independent power subject only to the Imperial Crown and was free of the rule of Württemberg.
On 25 November 1802, however, it was secularised and dissolved and became a lunatic asylum and later psychiatric hospital, which it is today, as well as the site of the Württemberg Psychiatry Museum.
The present buildings were constructed in German Baroque style from 1739–47 under the direction of Johann Michael Fischer (1692–1766) of Munich, who began overseeing the work in 1741. The interior, considered a model of Baroque design, is filled with ornate chapels and gilded balustrades, dominated by the high altar, which combines a Gothic statue of the Virgin Mary dating from 1430 with Baroque additions (dating from about 1750) by Johann Joseph Christian (1706–77). The elaborate frescoes are by Franz Joseph Spiegler (1691–1757).
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