The white grape variety is a new variety between Bacchus x Seyve-Villard 12-375(Villard Blanc). The two new varieties Phoenix and Sirius were created with the same parents. It contains genes from Vitis berlandieri, Vitis rupestris and Vitis vinifera. The hybrid was crossed in 1964 by Dr. Gerhardt Alleweldt (1927-2005) at the Institute for Grapevine Breeding Geilweilerhof in Siebeldingen-Pfalz. The name was given after the German noble family Hohenstaufen (the first intended name Silva was discarded because of the danger of confusion with Silvaner). Plant variety protection was granted in 1994. The variety is resistant to both mildew and botrytis, which is why it is considered a PIWI variety. It produces fruity tasting white wines. In 2010, the area under vines in Germany amounted to one hectare.