Germany, such as the Kammertbau in the Palatinate. Almost nothing is known of the style or quality of "German" wines that were produced in the Roman era, with the exception of the fact that the poet Venantius Fortunatus mentions red German wine around AD 570. From Medieval times to today Before the era of Charlemagne, Germanic viticulture was practiced primarily, although not exclusively, on the western side of Rhine. Charlemagne is supposed to have brought viticulture to Rheingau. The eastward spread of viticulture 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 century. Riesling has been documented from 1435 (close to Rheingau), and Pinot noir from 1318 on Lake Constance under the name Klebroth, from 1335 in Affenthal in Baden and from 1470 in Rheingau, where the monks kept a Clebroit-Wyngart in Hattenheim.<ref>[http://www.wein-plus.de/glossar/Pinot+Noir.htm Wein-Plus Glossar: Pinot noir'], accessed on February 17, 2008.</ref> The most grown variety in medieval Germany was however Elbling, with Silvaner also being common, and Muscat, Räuschling and Traminer also being recorded. For several centuries of the Medieval era, the vineyards of Germany (including Alsace) expanded, and is believed to have reached their greatest extent sometime around 1500, when perhaps as much as four times the present vineyard surface was planted. Basically, the wine regions were located in the same places as today, but more lands around the rivers, and land further upstream Rhine's tributaries, was cultivated. The subsequent decline can be attributed to locally produced beer becoming the everyday beverage in northern Germany in the 16th century, leading to a partial loss of market for wine, to the Thirty Years' War ravaging Germany in the 17th century, to the dissolution of the monasteries, where much of the winemaking know-how was concentrated, in those areas that accepted the Protestant reformation, and to the climatic changes of the Little Ice Age that made viticulture difficult or impossible