The wine-growing history of this country is linked to that of the Moselle; this river forms the border with Germany over a length of 36 kilometres. To the east on the other bank lies the German wine-growing region of the Moselle. The Romans introduced viticulture to the entire area as early as the 1st century BC. In the Middle Ages, viticulture boomed with the founding of many monasteries. An extremely cold winter in 1709 almost completely destroyed the vineyards. After a decision at the Congress of Vienna in 1815, the Grand Duchy of Luxembourg had to cede all vineyards on the other side of the river. From 1880 onwards, there was a great upswing due to a customs agreement. The Luxembourg wines made from the Elbling variety (at that time 90% share) were mostly exported to Germany as base wine for sparkling wine or as blended wine. However, this came to an end after the First World War.