Silvaner and Chasselas. The variety was created in 1940 at the StaatlichesWeinbauinstitutFreiburg in Baden-Württemberg by grape breeder Johannes-Friedrich
Rühl; StaatlichesWeinbauinstitutFreiburg (Wine Law in Everyday Life, published by the State Viticulture Institute, Freiburg), Promoverlag, Freiburg 2001