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The red grape variety originates from France. Synonyms are Castet, Engrunat, Gros Machouquet, Gros Verdau, Machoupet, Machouquet, Matioupet, Matiouquet, Maturana Tinta de Navarrete and Nicouleau. It should not be confused with the Béquignol Noir or Fer varieties, despite seemingly suggestive synonyms or morphological similarities. According to DNA analyses carried out in 2012, it originates from a presumably natural cross between Gros Cabernet x Camaraou Noir. However, this is based on only 20 DNA markers (see molecular genetics). The vine was found near the commune of Saint-Macaire in the forest around 1870 by a certain M. Nicouleau. A few years later, it was supposedly propagated by M. Castets from the commune of Saint-Pierre d'Aurillac (Gironde). However, it could also have been named after the commune of Castets-en-Dorthe. Castets was a crossing partner in the six Slovakian new varieties Hron, Nitranka, Rimava, Rudava, Torysa and Váh.

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