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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).
Valentino nero is a red Italian wine grape variety that is grown in the Piedmont wine region of northwest Italy but was initially bred at the Conegliano research center in the Veneto.