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