The red grape variety originates from Portugal. The approximately 50 synonyms indicate its great age. The most important, grouped by country, are Sousao, Souzao (California); Espadeiro Basto, Espadeiro da Tinta, Espadeiro de Basto, Espadeiro Preto, Negrão, Negrão pe de Perdiz, Pinhão, Sousão (2. Main name), Sousão de Correr, Sousão Forte, Souzão Forte, Tinta, Tinta Nacional, Tinto Antigo, Tinto de Parada, Tinto Nacional (Portugal); Azal Tinto, Caíño Gordo, Loureira Tinta, Negron, Pazao, Retinto, Sousón, Sousón Retinto, Tinta de Luzin, Tinta País, Tintilla, Vinon (Spain).

The picture of the grape variety (in the centre) comes from the work "Ampélographie - Traité général de viticulture" published in 1910 by the French authors Victor Vermorel (1848-1927) and Pierre Viala (1859-1936).
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