The red grape variety comes from Portugal. Synonyms are Grossa, Tinta Grossa and Tinta Grossa d'Alentejo. Despite its morphological similarities or the synonym that seems to indicate them, it must not be confused with the Grossa, Marufo or Tinta Barroca varieties (all with the synonym Tinta Grossa). According to DNA analyses carried out in 2013, it comes from a presumably natural cross between Hebén x Alfrocheiro. However, this is based on only 20 DNA markers (see molecular genetics). A cross between Marufo x Carrega Tinto gave rise to the variety Preto Martinho. The variety is cultivated in the Trás-os-Montes area. In 2010, 17 hectares of vineyards were designated (Kym Anderson).