While the Brachetto grape is believed to be native to Piedmont (with the Monferrato hills and the area around Asti being the most likely home of the grape), some ampelographers have speculated as early as the late 19th century that the grape might actually be French in origin.
The first mention that was definitively of Camaraou noir was in Viala & Vermorel catalogue of grape varieties produced from 1901-1910 by the French ampelographers Pierre Viala and Victor Vermorel.
However, while ampelographers do believe that Lagarino bianco was growing in the Trentino area during this time (with evidence supporting its planting around communes of Cembra, Faver and Grumes), not all are convinced that these references to weiss Lagrein are referring to Lagarino bianco with some speculating that the Jura wine grape Savagnin (known as Traminer in South Tyrol) being more likely the grape mentioned in these accounts.
As Marzemino was first documented growing in the Veneto in 1553, more than a hundred years before Marzemina bianca, ampelographers now believe that Marzeminia bianca is the offspring with further DNA profiling showing that the Soave grape Garganega (described by the Italian writer Pietro de' Crescenzi in the 13th century) likely being the other parent.