The red grape variety comes from Portugal; the name means "red dog", but the meaning is unknown. Synonyms are Castellana Negra, Farmento, Farnento, Teinta Cam, Tinta Cam, Tinta Cão, Tintilla Castellana and Tinto Cam. It must not be confused with the Padeiro (Tinto Cão) variety on the basis of apparently indicative synonyms or morphological similarities. The parentage (parenthood) is unknown. According to DNA analyses carried out in 2003, there could be a connection with the varieties Tinta Francisca and Viosinho. The variety was a cross-breeding partner of the new Rubired variety and a parent in the Malvarisco variety, which was probably created by natural crossing.