Rüsselsheim am Main'f foundation goes back to a Frankish colony in the first half of the 5th century CE. The first written record of  Rüsselsheim am Main (known as Rucilesheim) goes back to 840 CE. In 1435, Count John IV of Katzenelnbogen was the first to cultivate Riesling, a white grape variety that orginated in the Rhine region. Riesling wines are pure and seldom oaked. They are dry, semi-sweet, and sparkling whine wines. Riesling grapes were planted down the river Rhine and up the river Mosel. After World War I, viticulture disappeared in  Rüsselsheim am Main. There is a museum-vineyard near the castle which celebrates 550 Years of Riesling .  Today the population is almost 68 000 people.