Copper‑Age Voices of Southwest Iberia

The Chalcolithic communities of southwest Iberia rose along the fertile Guadalquivir plain, where Valencina de la Concepción and the Montelirio complex (PP4‑Montelirio) near Sevilla became focal points for ritual and social display. Archaeological data indicates intensive monument construction and emergent social differentiation between ca. 3300 and 2500 BCE, with large megalithic tombs, special‑purpose enclosures, and rich burial offerings that evoke an increasingly unequal society.

Cinematic scenes—copper glinting in lamplight, processions at stone portals, the hush of ancestral chambers—are built from pottery styles, metalworking debris, and burial architecture. Material culture and isotope studies suggest long‑range exchange of copper and finished goods across Iberia and beyond. Limited evidence suggests that some elite mortuary spaces were used repeatedly over generations, hinting at hereditary status or kin‑based control of ritual landscapes.

Archaeological interpretation remains cautious: stratigraphy and radiocarbon sequences anchor a broad timeline, but local developments unfolded unevenly. The cultural horizon known as Chalcolithic Southwest Iberia is therefore best seen as a tapestry of linked communities—networked by trade, ritual, and marriage—rather than a single centralized polity.

Eleven individuals attributed to Spain_SW_Iberia_CA (dated ca. 3300–1500 BCE) provide a first window into the biological makeup of Chalcolithic southwest Iberia. Y‑chromosome data show a notable frequency of haplogroup I (observed in 5 of the 11 males sampled). MtDNA is dominated by haplogroup K (recorded in five individuals), with two cases of U and single instances of H3, T, and H—while one sample lacks a confidently assigned mitochondrial lineage in the published count.

These patterns mirror broader regional tendencies: mtDNA K is commonly associated with Neolithic farmer maternal lineages in western Europe, whereas Y‑haplogroup I has deep roots in European hunter‑gatherer populations and later local continuity. Archaeogenetic interpretation suggests a layered ancestry in which farmer‑derived maternal lineages coexist with substantial local male‑line continuity—consistent with archaeological models of assimilation and local persistence.

Caveats are essential. Eleven samples offer promising insights but remain limited; population heterogeneity across sites and time slices means broader sampling could change frequency estimates. The relative absence of R1b in this small set does not preclude its presence elsewhere or later. Future ancient DNA from surrounding regions and chronological horizons will better resolve migration, kinship, and sex‑biased processes hinted at here.