One of those population groups, the reconstructed population 1 group a (RPP1a), which includes most of the Galician varieties of the germplasm bank, embraces the Caiño group. This is considered the most ancient lineage of grapevine in the northwestern area of the Iberian Peninsula. Its origin variety is considered 'Caino Bravo' synonym of 'Amaral' ('Azal Tinto') in Portugal [19] given the high number of alleles that it shares with other varieties included in the group such as 'Castanfal', 'Souson', 'Caino Longo', 'Caino Tinto' (syn. 'Caino Redondo 1') and 'Caino Blanco' [16; 20]. It even has a parental relationship with some of them, such as 'Caino Blanco', probably descended from 'Caino Bravo' and 'Albarino' [17]. Some other minority varieties could also be included in the Caiino group despite not having such a close relationship with 'Caino Bravo'. Those are: 'Brancellao', 'Loureira', 'Albarino' and 'Verdello Blanco' [17]. Generally, all varieties included in the Caiino group are characterized by their lower potential alcohol degree, longer vegetative cycle and higher acidity rate. In addition to the genetic data previously mentioned, recently [PERSON] et al. [21] have found a possible relationship between _Vitis vinifera_ L. cultivated varieties grown in the north of Portugal, close to the Galician area, and _Vitis vinifera_ L. _sylvestris_. This study brings out a possible close genetic relationship between 'Caino Bravo' (syn. 'Amaral') and _V. vinifera_ L. _sylvestris_ and would support other phenotypic and physicochemical similarities among 'Caino Bravo' grapes with those of _V. vinifera_ L. _sylvestris_. Both show small bunches, dark blue grapes and high acidity rates. Furthermore, 'Bravo' means sylvestris in Galicia. In addition to these interesting genetic research findings, there is an enological known quality of some of the varieties of the group. 'Albarino' and 'Loureira' in Spain (synonyms of 'Alvarinho' and 'Loureiro', respectively in Portugal) and 'Caino Blanco' in Portugal are the most important varieties for the elaboration of monovarietal white wines [17] in the northwestern area of the Iberian Peninsula, including Galicia and regions from the North of Portugal. With respect to the red varieties, the climate change incidence makes it necessary to have varieties with lower potential alcohol degree, higher levels of acidity and high polyphenic content, all of them general characteristics of Caino group red varieties [21]. In addition to this eenological potential based on their physicochemical parameters and due to the importance of the volatile composition of a wine in its quality [22], the study of the aromatic composition of these minority varieties is also very important to complete their eenological characterization. Aromatic compounds of grapes such as monoterpenes, C\({}_{13}\)-norisoprenoids, methoxypyrazines, C\({}_{6}\) alcohols, benzene or sulphur compounds, which would be considered the potential varietal aroma of the wines, have a very important role in the quality as well as in the typicity of wines [23; 24; 25]. In addition to their importance in wine quality, the different aromatic compounds in grapes have also been evaluated to serve as varietal markers, useful for varietal differentiation. The varietal aroma compounds are different for each grape variety, they have been considered for grapevine varietal characterization and classification [26] as they impart specific aromas to each wine [27]. [PERSON]. [28] already related terpen and other compounds with terpenic origin, as important grape varietal compounds that characterized aromatic wines, not only from muscat but also from non-muscat cultivars. C\({}_{6}\) alcohols have been assessed as varietal markers for the identification of the origin of the wine [24]. The variation in key molecules from different families (terpenes, alcohols, or aldehydes) as well as the identification of specific aromatic descriptors have been also used as markers for specific varieties [22].