The red grape variety is a new breed between Carignan Noir(Mazuelo) x Cabernet Sauvignon. Synonyms are Cabernet Ruby, California 234 F2, Roubi Cabernet and Rubi Kaberne. The crossing was done in 1936 at the University of California in Davis by Dr. Harold P. Olmo (1909-2006). The breeding goal was to develop a variety suitable for the hot regions in California for Bordeaux-like wines. It later turned out, however, that it is also well suited for much cooler regions. The variety was later used under the breeding number F2-7 for the less successful new varieties Carmine, Carnelian and Centurion.