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before 986
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Founded as a House of Canonesses by Count Wale and his wife Odelinth The first abbess was probably their daughter Mechthildis.
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986
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Earliest recorded reference on the occasion of a donation by Otto III, King of Saxony.
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1255
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Earliest introduction of the Benedictine rule.
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1482
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Erneute Einführung der Benediktineregel durch Anna von Nassau, Schwiegertochter des Herzogs Friedrich d. Ä. von Braunschweig und Lüneburg
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1482
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Renewed introduction of the Benedictine rule by Anna von Nassau, daughter-in-law of Duke Friedrich the Elder of Brunswick and Luneburg.
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