1
Maybe more since IA, in BA the celts were only in NE Iberia
also Romans and Greeks had a significant genetic impact
"The impact of mobility from the Central/Eastern Mediterranean during the Classical period is also evident in 10 individuals from the 7th-8th centuries CE site of L’Esquerda in the northeast, who show a shift from the Iron Age population in the direction of present-day Italians and Greeks (Fig. 1D), accounting for approximately one quarter of their ancestry (Fig. 2C and table S17). The same shift is also observed in present-day populations from Iberia outside the Basque area and is plausibly a consequence of the Roman presence in Iberia, which had a profound cultural impact and, according to our data, a substantial genetic impact too."
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