Timeline of Galician History
In the Paleolithic period, the Neanderthal Man enters the Iberian Peninsula.
The first large settlement of Europa by modern humans, nomadic hunter-gathereres coming from the steppes of Central Asia, characterized by the M173 mutation in the Y chromosome, defining them as haplogroup R population. When the Ice Age reached its maximum extent, these modern humans took refuge in Southern Europe, namely in Iberia, and in the steppes of Siberia.
Modern humans make way into the Iberian Peninsula, coming from southern France. Here, this genetically homogenous population (characterized by the M173 mutation in the Y chromosome), will develop the M343 mutation, giving rise to the R1b haplogroup, still dominant in modern Portuguese and Spanish populations.
The populations sheltered in Iberia, descendants of the Cro-Magnon, given the deglaciation, migrate and recolonize all of Western Europe, thus spreading the R1b haplogroup populations (still dominant, in variant degrees, from Iberia to Scandinavia).
The nomadic hunter-gathereres of the R haplogroup (characterized by the M173 mutation in the Y chromosome) that had taken refuge during the Last Ice Age in the steppes of Siberia (and had developed the M17 mutation, originating the R1a Haplogroup), give rise to the Proto-Indo-European cultures.
First wave of migrations into Iberia of the Urnfield culture (Oestrimni, speakers of the Proto-Celtic language).