I agree w most of what you ve just synthetized Galati A very good comment HOwever there s only one thing that is important You talk about scientific studies and i strongly recommend that such articles SHOULD rely on them because they don t need literature So i just must remind ourselves that studies sourced in the article such as this one clearly state this The results shown by the Central Iberian Peninsula seem to lend support to a model of settlement population stocks which came from the region of Castilla Leon after the Islam invasions whereas in the South East populations the genetic record of Middle Eastern populations is still present a consequence of the expansion of Islam in Southern Europe in the Middle Ages