The white grape variety (also Geisenheim 22-73) is a new variety between Müller-Thurgau x Chasselas Blanc according to DNA analyses published in 2012. The crossing of two Riesling clones indicated in the breeding list turned out to be wrong. It was named after the archbishop and scholar Rabanus Maurus (780-856) of Mainz. The cross was made in 1939 by the breeder Heinrich Birk (1898-1973) at the Geisenheim Research Institute (Rheingau). It is cultivated in small quantities in Baden-Württemberg, but in 2010 no stocks were recorded (Kym Anderson).
Pictures: Ursula Brühl, Doris Schneider, Julius Kühn Institute (JKI)