The red grape variety originates from the border region Italy/Switzerland. Synonyms are Barau, Durás, Fiori, Neirét dal Picul Rus, Nerdala, Nerdela, Provinè, Pruinè, Uva di Biella, Verdés and Vernassa. It must not be confused with the Neret di Saint-Vincent variety, despite the fact that synonyms or morphological similarities appear to indicate this. It has long been suspected to originate from the Aosta Valley, where it was first mentioned in 1838. However, it is possible that it originated in Piedmont because the two varieties cultivated there, Uva die Biella and Vernassa, are identical. According to DNA analyses carried out in 2011, it is closely related to the Piedmontese variety Avarengo. In Switzerland, this variety is included in the Old Plant Variety Group.