The Genetic History of Portugal: Five Millennia at Europe’s Atlantic Edge

Ancient DNA now traces Portugal’s population history from Mesolithic foragers through the Neolithic transition, the Beaker/Bronze Age steppe pulse, Roman and Islamic-period mobility, to the subtle regional structure seen today.

From hunter-gatherers to early farmers (Mesolithic → Neolithic)

Genome-wide transects across Iberia show that by the Neolithic (from ~5500 BCE) Anatolian-related farmers moved into the peninsula and mixed with local Western Hunter-Gatherers (WHG). This farmer, forager blend persisted into the Chalcolithic, with a north-east to south-west gradient in the persistence of WHG-associated ancestry recorded in new Portuguese ancient genomes.

The Bronze Age transformation: Steppe ancestry and DF27

Like elsewhere in Western Europe, Steppe-derived ancestry arrived in Iberia during the 3rd, 2nd millennium BCE, much of it via Bell Beaker networks. In Iberia this brought major autosomal change and, strikingly, near-complete turnover of Y-chromosomes to R1b-M269, with the Iberia-focused branch R1b-P312→DF27 later exploding in frequency (today peaking in Spain and Portugal). High-resolution Y-capture work refines DF27’s internal tree and highlights its rapid Bronze-Age radiation and Atlantic vs. Mediterranean substructure.

Iron Age and Roman Iberia: mobility without erasing locals

Across Iron Age Iberia, continuity from Late Bronze Age populations is common, but Mediterranean connectivity (Phoenician, Greek, Roman) layered in additional ancestry streams. A peninsula-wide transect shows sustained local ancestry with episodic inputs from the Mediterranean world during the Roman period. Portugal-focused genomes pinpoint sites such as Idanha-a-Velha as Roman-era hubs drawing North-African and Eastern-Mediterranean ancestries, embedded within a mainly local background.

The Early Medieval centuries: Central-European lineages reach the northwest

The Migration Period left a genetic footprint more clearly in the north than in the south. In Portuguese series, Central-European, associated ancestry appears in the Early Medieval north (consistent with Suebi/Visigoth horizons), while the south shows stronger continuity with earlier locals.

Al-Andalus and the south’s African bridge

By the Islamic centuries, Portugal’s south (Algarve, Alentejo) shows measurable North-African and Levantine-related ancestry, reflecting Umayyad and later Almoravid/Almohad connections. This admixture did not homogenize the entire country, creating a subtle north, south cline that is still visible in genome-wide analyses today.

Early Modern Portugal and Atlantic links

By the 15th, 18th centuries, Portugal was deeply tied to the Atlantic. Early Modern genomes already cluster tightly with present-day Portuguese, but case studies detect traces of Atlantic slavery and colonial-era contacts (West Africa, Brazil, Atlantic Islands), mostly in urban or southern contexts.

Continuity into the present

Overall, the Portuguese population today represents a deeply local base laid down since the Bronze Age, layered with southern Mediterranean and North-African inputs in the south, and modest Central-European ones in the north. Ancient DNA from multiple time slices (Mesolithic, Neolithic, Bronze Age, Medieval, Modern) now clarifies this trajectory, showing how Portugal became one of Europe’s most distinctive yet internally diverse genetic landscapes.

G25 Coordinates

For those interested in further analysis or visualization, here are the G25 coordinates of the sample:

G25 · G25 Coordinates
Portugal_Centro_EarlyMedieval:PT_24169__AD_850__Cov_11.45%,0.060326,0.148267,0.016216,-0.034238,0.030159,-0.014223,-0.007285,0.011769,0.041314,0.030616,-0.00747,-0.007343,0.008771,-0.005367,0.014929,-0.005171,0.026207,-0.009502,-0.02162,0.008129,0.006364,-0.006801,0.003944,0.013255,0.003712 Portugal_Centro_EarlyMedieval:PT_24170__AD_850__Cov_69.14%,0.063741,0.141159,0.007165,-0.031331,0.022158,-0.011992,-0.008695,0.002308,0.027815,0.026789,-0.001624,-0.001349,0.002825,-0.007844,0.013301,-0.006099,-0.000782,-0.009248,-0.01433,0.007379,-0.00836,-0.00507,0.004437,-0.004458,0.004311 Portugal_Centro_EarlyMedieval:PT_24173__AD_850__Cov_34.27%,0.078538,0.145221,0.011691,-0.036822,0.027082,-0.014223,-0.01081,0.005538,0.030065,0.035536,0.00682,-0.003297,-0.011001,-0.01156,0.0076,-0.016574,-0.010822,-0.00266,-0.017095,-0.009004,-0.004742,-0.006925,0.001725,-0.005181,-0.002155 Portugal_Norte_Medieval:PT_22989__AD_1100__Cov_32.06%,0.121791,0.137096,0.039598,0.021318,0.033237,-0.001673,0.00235,0.005077,0.019839,0.027153,0.003248,0.006894,-0.012933,-0.009221,0.014115,0.003447,-0.00013,0.005194,0.007919,-0.004877,-0.002121,0.006554,-0.00037,-0.001325,-0.000359 Portugal_Norte_Medieval:PT_22992__AD_1100__Cov_57.51%,0.113823,0.142174,0.037712,-0.005168,0.044316,-0.005299,-0.003995,0.007615,0.029451,0.02934,-0.002598,0.01139,-0.016353,-0.012524,0.002307,0.002784,-0.00339,-0.003927,-0.006536,0.003502,0.000499,0.000866,-0.002958,0.002892,-0.000359 Portugal_Norte_Medieval:PT_22994__AD_1100__Cov_68.20%,0.105855,0.140143,0.039221,-0.008721,0.042469,-0.005578,-0.00517,0.008077,0.026793,0.028429,0.005521,0.006744,-0.019029,-0.009083,0.014115,-0.005967,-0.001565,0.005954,0.00176,0.000625,0.012852,-0.010881,0.001602,-0.009399,-0.010059 Portugal_Algarve_Medieval:PT_24175__AD_1150__Cov_55.77%,0.085367,0.144205,0.02225,-0.028747,0.043085,0.000558,-0.012221,0.006692,0.031292,0.037541,-0.001299,0.007194,-0.010406,-0.025047,0.007872,0.009812,0.0103,-0.00266,-0.006285,0.004877,-0.000998,-0.008408,0.00419,-0.003735,-0.000838 Portugal_Algarve_Medieval:PT_24176__AD_1200__Cov_9.80%,0.071709,0.147252,0.021873,-0.020672,0.03416,-0.025658,-0.017391,-0.002308,0.04295,0.047746,0.02111,-0.000599,-0.022894,-0.03413,0.002579,-0.007558,-0.011735,-0.003041,-0.012193,0.001876,-0.005615,-0.00136,0.007025,0.005543,-0.002155 Portugal_Algarve_Medieval:PT_24178__AD_1200__Cov_15.68%,0.066017,0.139128,0.029793,-0.01938,0.036314,-0.014781,-0.01034,-0.003231,0.044382,0.044466,0.003735,-0.0003,0.008176,-0.009221,0.007872,0.012994,0.015385,-0.01913,-0.000754,0.01063,0.022086,-0.011871,0.014173,-0.007712,-0.010418 Portugal_Algarve_Medieval:PT_24179__AD_1250__Cov_68.52%,-0.14797,0.116786,0.021119,-0.021641,0.020004,-0.01506,-0.022561,0.020538,0.022907,0.028611,0.000974,0.00045,0.016204,-0.01913,0.00665,0.005038,0.010822,-0.007855,-0.006159,-0.002251,0.000998,-0.019537,0.012448,0.00494,0.008023 Portugal_Algarve_LateMedieval:PT_24180__AD_1300__Cov_15.60%,0.081953,0.147252,0.033941,-0.024548,0.03693,-0.015897,-0.023736,0.007154,0.032315,0.026606,0.012991,0.005095,-0.001487,-0.014038,0.022665,0.006762,-0.014473,-0.004561,-0.011816,0.010755,0.001248,0.002597,0.008751,-0.005181,-0.002036 Portugal_Centro_LateMedieval:PT_22218__AD_1300__Cov_67.87%,0.114961,0.148267,0.041483,-0.007752,0.048932,-0.006136,-0.00611,0.002077,0.026793,0.031891,-0.002923,0.009442,-0.001189,-0.012248,0.008822,-0.019358,-0.006258,-0.004941,-0.004525,-0.000625,0.00262,-0.002597,-0.004807,-0.010242,0.005748 Portugal_Centro_LateMedieval:PT_22219-23224__AD_1300__Cov_67.58%,0.1161,0.142174,0.040729,-0.002584,0.048624,-0.000837,-0.001175,0.005769,0.027202,0.030433,-0.005846,0.005095,-0.015015,-0.02491,0.007465,0.001591,0.003651,0.004814,0.001885,-0.001751,0.005241,-0.005688,-0.012571,0.006025,0.005389 Portugal_Centro_LateMedieval:PT_22220__AD_1300__Cov_16.42%,0.118376,0.148267,0.038466,-0.000969,0.050471,-0.011992,-0.011986,-0.007846,0.025565,0.035901,0.004709,0.004196,-0.005054,-0.003853,0.01045,-0.003845,0.012126,-0.011655,-0.003268,0.009379,0.00025,0.000618,0.011709,0.001446,0.000479 Portugal_Centro_LateMedieval:PT_23221__AD_1300__Cov_14.63%,0.112685,0.152329,0.042238,-0.005814,0.035083,-0.00251,0.0047,0.009923,0.030474,0.0277,-0.012017,0.006744,-0.010555,-0.007569,0.005293,0.007292,-0.007562,-0.006588,-0.006913,-0.000625,0.001373,-0.005564,0.013064,-0.001928,-0.008861 Portugal_Centro_LateMedieval:PT_23223__AD_1300__Cov_63.61%,0.106994,0.148267,0.029415,-0.003553,0.044008,-0.001394,-0.008695,-0.002308,0.016157,0.023326,0.004872,0.003297,-0.005946,-0.012248,0.001629,0.009944,0.014864,0,-0.011564,0.004877,0.000998,-0.004328,0,0.004338,0.004191 Portugal_Centro_LateMedieval:PT_23226__AD_1300__Cov_81.28%,0.106994,0.135065,0.035826,-0.006783,0.038161,-0.000837,-0.005405,0,0.025975,0.024237,0.005684,0.006744,-0.016353,-0.010872,0.013843,-0.001061,-0.018515,-0.006714,-0.004274,0.00075,0.003993,-0.000866,0.001972,-0.002169,0.002036 Portugal_Centro_LateMedieval:PT_23227__AD_1300__Cov_50.82%,0.100164,0.145221,0.030547,-0.005168,0.029544,0.001116,-0.009165,0.001154,0.023316,0.030798,0.001461,0.008243,-0.018731,-0.007019,0.013979,0.00305,-0.001173,-0.00228,-0.003394,0.004752,-0.002371,-0.004699,0.000246,-0.007109,-0.00467 Portugal_Centro_LateMedieval:PT_23229__AD_1300__Cov_57.82%,0.097888,0.141159,0.044877,0.00323,0.045547,-0.001952,-0.015511,0.007846,0.033133,0.020593,-0.00065,0.005995,-0.006392,-0.014588,0.011401,0.002387,-0.004042,0.00076,-0.001131,-0.005503,-0.000499,-0.004204,-0.001602,-0.002771,0.002155 Portugal_Centro_LateMedieval:PT_23230__AD_1300__Cov_48.10%,0.103579,0.139128,0.043369,0.000969,0.037545,0.001952,0,0.013846,0.029247,0.031527,-0.002761,0.007343,-0.01665,-0.007156,0.010858,0.006099,0.000913,0.000887,-0.000628,0.001126,0.002121,-0.000247,0.001849,-0.000241,-0.001317 Portugal_Lisboa_LateMedieval:PT_24163__AD_1300__Cov_58.29%,0.099026,0.14319,0.034695,-0.015827,0.041546,-0.00753,-0.00846,0.004384,0.031292,0.025331,0.004547,0.002847,-0.01219,-0.01101,0.015201,-0.00716,-0.011343,-0.004561,-0.010559,-0.015382,0.000499,-0.008656,0.009983,0.000482,-0.001197 Portugal_Lisboa_LateMedieval:PT_24164__AD_1300__Cov_53.16%,0.099026,0.142174,0.035826,0.000323,0.035391,0.003068,0.00188,0.008307,0.029247,0.028429,0.003897,0.004646,-0.013528,-0.013487,0.015744,0.007425,0.011343,-0.00228,-0.009176,0.001376,0.003619,-0.013231,0.006532,0.00241,-0.005748 Portugal_Lisboa_LateMedieval:PT_24165__AD_1300__Cov_27.26%,0.097888,0.149283,0.037335,-0.001292,0.033237,-0.014223,0.001645,0.002538,0.02168,0.031709,0.000812,-0.002847,-0.004757,-0.004404,0.014522,-0.01432,-0.015255,0.006968,0.008296,-0.004252,0.002496,-0.011252,0.003204,-0.002169,-0.007784 Portugal_Lisboa_LateMedieval:PT_24166__AD_1300__Cov_12.42%,0.086506,0.152329,0.036958,0.003876,0.048932,0.000279,-0.016686,0.002538,0.027611,0.015672,-0.00341,0.010041,-0.009068,-0.009771,0.009772,-0.013126,-0.023339,-0.005954,-0.007039,-0.001751,-0.00025,-0.011871,-0.001356,-0.020846,-0.000599 Portugal_Lisboa_LateMedieval:PT_24167__AD_1300__Cov_54.30%,0.097888,0.140143,0.036204,0.010013,0.041854,-0.004741,-0.00282,0.003461,0.023725,0.021322,-0.008444,0.002548,-0.011893,-0.016239,0.006786,0.003713,-0.005867,0.003041,-0.006536,-0.005378,0.002371,-0.012736,-0.009737,0.002289,0.002395 Portugal_Algarve_LateMedieval:PT_24181__AD_1350__Cov_22.88%,0.086506,0.141159,0.01961,-0.026486,0.033237,0.006693,0.000705,0.008769,0.021066,0.031345,0.011205,0.003597,0.001635,-0.024084,0.003257,0.001724,0.022165,-0.002154,-0.010684,0.00075,-0.001373,0.001484,0.011339,0.00241,-0.00479 Portugal_Centro_EarlyModern:PT_23214__AD_1750__Cov_60.96%,0.101303,0.14319,0.034695,-0.001615,0.030467,0.003068,-0.00517,0.001846,0.023929,0.024055,0.00406,0.007493,-0.00773,-0.006055,0.009365,-0.00053,-0.01695,0.0019,-0.008045,-0.005878,0.007112,-0.004328,0.003081,-0.009519,0.004431 Portugal_Centro_EarlyModern:PT_23215__AD_1750__Cov_89.43%,0.106994,0.140143,0.033187,-0.000969,0.046778,-0.003068,-0.006815,0.002769,0.027611,0.030069,-0.009094,0.004796,-0.008474,-0.013074,0.011808,-0.002254,0.007171,0.00228,0.000126,0.001501,0.000624,-0.003462,-0.000863,-0.008073,0.003952 Portugal_Centro_EarlyModern:PT_23216__AD_1750__Cov_70.13%,0.103579,0.145221,0.04186,-0.002584,0.045855,-0.003904,0,0.008307,0.024338,0.022597,-0.001949,0.007194,-0.009366,-0.022983,0.013843,0.011535,0.017993,0.001647,-0.00088,0,0.00025,-0.000371,0.003821,-0.003374,0.000599 Portugal_Centro_EarlyModern:PT_23217__AD_1750__Cov_45.93%,0.099026,0.147252,0.04714,-0.006783,0.042469,-0.008367,-0.004935,0.002769,0.022702,0.033896,-0.001461,0.005695,0.001041,-0.012937,0.009093,-0.008088,-0.015776,0,-0.00993,0.000625,0.005865,0.00779,0.004314,-0.007712,0.003113 Portugal_Centro_EarlyModern:PT_23241__AD_1750__Cov_64.43%,0.108132,0.138112,0.033564,-0.007106,0.041546,-0.005578,-0.007285,0.001846,0.026588,0.030616,-0.008282,0.004196,-0.013379,-0.007019,0.007465,0.001458,-0.000391,-0.007601,-0.008045,-0.002626,0.002371,-0.005441,-0.006039,-0.006507,-0.001676 Portugal_Centro_EarlyModern:PT_23242__AD_1750__Cov_36.58%,0.101303,0.133034,0.039221,-0.003553,0.028621,-0.006972,-0.00611,0.002077,0.02352,0.029887,-0.000325,0.012439,-0.020664,-0.018992,0.016422,0.005038,-0.001695,-0.003927,-0.01257,0.008004,-0.001622,-0.003091,0.001602,-0.011929,-0.006347 Portugal_Norte_EarlyModern:PT_22190__AD_1750__Cov_38.38%,0.104717,0.144205,0.032055,-0.014212,0.042777,0.001394,-0.002115,-0.001615,0.025975,0.030069,0.006658,0.004496,-0.011447,0.000138,0.010586,-0.008884,-0.015907,-0.000507,-0.002514,-0.017258,-0.003743,-0.004822,-0.000493,-0.002651,0.006826 Portugal_Centro_Modern:PT_22179__AD_1850__Cov_84.72%,0.125205,0.135065,0.054682,0.034561,0.048317,0.015897,0.00282,0,0.0045,0.00328,-0.003735,0.00015,-0.013379,-0.004266,0.016151,-0.001061,-0.008736,-0.001774,0.004525,-0.001501,0.005116,0.009274,0.007148,0.018918,-0.004071 Portugal_Centro_Modern:PT_22183__AD_1850__Cov_85.59%,0.102441,0.149283,0.042615,-0.004199,0.043085,-0.000279,-0.005875,0.007615,0.026793,0.024055,-0.000487,0.006594,-0.010258,-0.020231,0.016422,0.000796,-0.001565,-0.003927,0.000628,0.000625,0.009733,-0.002844,-0.000739,0.011447,-0.002155

Sources