What is "albarossa"

Albarossa is a red Italian wine grape variety that was created in the Veneto wine region in 1938 by grape breeder Giovanni Dalmasso at the Istituto Sperimentale per la Viticoltura in Conegliano. Dalmasso originally thought he created the grape from a crossing of Nebbiolo and Barbera but DNA profiling in 2009 confirmed that the "Nebbiolo" vine used wasn't Nebbiolo at all but rather a very old French wine grape variety from the Ardèche, Chatus. The confusion stemmed from a synonym of Chatus, Nebbiolo di Dronero (Nebbiolo of Dronero, a small commune in the Piedmont wine region where Nebbiolo is grown but so apparently was Chatus).