The white grape variety (also Geisenheim 22-73) is a new breed between Müller-Thurgau x Chasselas blanc published according to 2012 DNA analysis, The intersection of two indicated in the breeding list Riesling clones it turned out to be wrong. It was named after the archbishop of Mainz and scholar Rabanus Maurus (780-856). The crossing took place 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 in 2010 no stocks were reported (Kym Anderson ).
Pictures: Ursula Bruehl, Doris Schneider, Julius Kühn Institute (JKI)