This window was restored from 1978-1980. Valuable pieces of medieval glass (1300) were used in the restoration process. The abbey started operating two glassworks in the 13th century. During the glass making process various pigments from natural resources, for example earths, salts or metal-oxides were added to the colourless heated glass to achieve unique colour schemes. The coloured glass sections were then held together with strips of lead. Then the ornamental motives were painted. Despite early Cistercian rules stressing simplicity, the entire abbey church was completely fitted with coloured windows during the 14th century. Depicted are John the Baptist, Virgin Mary with the Christ child in Bethlehem, John the Evangelist and beneath him Duchess Anastasia von Mecklenburg (died 1317), who sponsored a window for the abbey church. 