The Rheingau was as a Gau or county of the Frankish Empire, bordered by the Niddagau, the Maingau, the Oberrheingau, and the Lahngau; the counts of the Rheingau were known as Rhinegraves. The first Rhinegrave on record is Hato VI (937�960).
In 983, Otto II, Holy Roman Emperor, gave the Rheingau, together with other territories, to the Archbishopric of Mainz during the Diet of Verona. When the Archbishopric was dissolved in 1806, the Rheingau was given to the Duchy of Nassau.
As a result of the marriage of John III (1383�1428) to Adelheid, scion of the Wildgraves of Kyrburg, John V (1476�95) inherited territories in the Obersalm Wasgau, to the left of the Rhine (from the Nahegau, on the River Nahe and in the Alsace) from the Wildgraves and the counts of Salm, so that these territories also came to be linked to their name, with the counts using the title "Wild- and Rhinegraves of Salm".
Since the Verona donation in 983, the Rheingau belonged to the archbishopric of Mainz. Legend has it that Charlemagne let the first vineyards be planted in the region, close to present-day Schloss Johannisberg. Better documented is the early influence of the church on Rheingau winemaking, which was controlled from Eberbach Abbey. Augustinians and Benedictines are known to have inhabited the area of the later abbey from 1116, and in 1135 the Cistercians arrived, sent out from Clairvaux. Legend has it that the Cistercians, which are also credited with having founded the wine industry in Burgundy, brought Pinot noir with them to Rheingau, although the earliest record of the grape variety in Rheingau is from 1470. The slopes down from the Taunus mountains belonging to Kloster Eberbach were planted as vineyards in the 12th Century, and early in the 13th Century the vineyards had reached their present area. In medieval times, more red than white wine was produced, usually as Gemischter Satz, i.e. the vineyards were planted with mixed varieties which were vinified
