Reserve wine system, most DACs have an additional "Reserve" designation for a wine which has slightly more strict requirements. Before the 1971 German wine law, a term corresponding to reserve wine existed in "kabinett", sometimes written as "Kabinettwein". In 1971, the similar-sounding term "Kabinett" was instead introduced as the lowest level of the "Prädikatswein" category, i.e., with a completely different meaning. Therefore, in the present German wine classification no legally defined term corresponding to reserve wine exists. Reserve wine Reserve wine is wine of a higher quality than usual, or a wine that has been aged before being sold, or both. Traditionally,
German wine coincided with the spread of Christianity, which was supported by Charlemagne. Thus, in Medieval Germany, churches and monasteries played the most important role in viticulture, and especially in the production of quality wine. Two Rheingau examples illustrate this: archbishop Ruthard of Mainz (reigning 1089-1109) founded a Benedictine abbey on slopes above Geisenheim, the ground of which later became Schloss Johannisberg. His successor Adalbert of Mainz donated land above Hattenheim in 1135 to Cistercians, sent out from Clairvaux in Champagne, who founded Kloster Eberbach. Many grape varieties commonly associated with German wines have been documented back to the 14th or 15th