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            The 17th and 18th centuries | 
        
    
    
                    | 1601 | 
                    The first chronicle of Walkenried Monastery, written by Johannes Letzner, is published. 
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                    | 1626 | 
                    During the Thirty Years' War, the "Harzschützen" plunder the monastery. 
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                    | 1629 | 
                    During the Thirty Years' War, Cistercians from Kaisheim in Swabia take control of Walkenried and for three years attempt to re-Catholicize it. 
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                    | 1631 | 
                    The Cistercians from Kaisheim flee from the Swedes, taking with them the late-mediaeval altar of Hans Raphon. 
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                    | 1636 | 
                    The Protestant monastery school reopens. 
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                    | 1648 | 
                    The Protestant convention is removed and the monastery secularized. 
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                    | 1661 | 
                    A former pupil at the Walkenried Monastery school, Johann Heinrich Hofmann, sketches the ruins of the monastery church. 
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                    | 1662 | 
                    The former monks' hospital (infirmarium), part of the enclosure (seclusion area), is demolished. Following the Thirty Years' War, the monastery buildings are in very bad shape.  
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                    | 1668 | 
                    The monastery school, which had been attended by a total of 1200 or 1300 pupils, is finally closed. Walkenried becomes a complex of domains and an administrative centre. 
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                    | from 1672 | 
                    The Gothic monastery church is used as a source of stone for around 150 years. 
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                    | from 1682 | 
                    Parts of the enclosure (seclusion area) are demolished. 
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                    | from 1695 | 
                    Several small farms are operating within the church ruins. 
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                    | 1715 | 
                    The bronze fountain, cast in 1220, is transported to Salzdahlum/Braunschweig on the orders of Duke August Wilhelm and probably melted down; by 1813 its location is unknown. 
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                    | 1723 | 
                    A plan of Walkenried Monastery is drafted. 
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                    | from 1725 | 
                    A ducal hunting lodge is built south-west of the monastery buildings; today it is in private hands. 
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                    | 1737 | 
                    The cells of the dormitory are in use as granaries. 
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                    | 1739 | 
                    The lay brothers' wing on the western side of the cloisters is demolished and the bell tower rebuilt. 
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                    | 1757 | 
                    The cells in the dormitory, which had been used to store grain, are removed and the dormitory converted into several storage areas. |