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This work presents the first results of carbon isotope (C-13) analysis of seeds (Triticum dicoccum, Triticum aestivum/durum, Triticum cf. spelta and Hordeum vulgare L.) from archaeological contexts from the settlement sites of A Fontela and Castrovite in Northwest Iberia, which cover a chronological range between 1050cal BC and 25cal AD. In addition, 142 present-day wheat seeds from 16 plots cultivated in 2014 and 2015 across this region were analysed. The results obtainedfor A Fontela and Castrovite were -23.6 parts per thousand (between -25.3 and -21.4) and -24.0 parts per thousand (between -26.6 and -21.8), respectively. Taking into account changes in the isotope composition of atmospheric carbon (C-13(atm)), the C-13 values were 17.5 parts per thousand (A Fontela) and 18.0 parts per thousand (Castrovite). In Castrovite, differences between storage facilities were detected, which could be related to the exploitation of different areas for cultivation, possibly indicating a family-based organization of agricultural production.