appeared two new cultures: Solutrean and Magdalenian. The Epipaleolithic was centered in Lower Aragon, occupying the epoch between the 7th and the 5th millennium. In the first half of the 5th millennium BCE, Neolithic remains are found in the Huescan Outer Ranges and in Lower Aragon. The Eneolithic was characterized in the province of Huesca presenting two important megalithic nuclei: the Pre-Pyrenees of the Outer Ranges and the High Pyrenean valleys. The Late Bronze Age begins in Aragon around 1100 BCE with the arrival of the Urnfield culture. They are Indo-European people, with an alleged origin in Central Europe, who incinerate their dead by placing the ashes in a funeral urn. There are examples in the Cave del Moro of Olvena, the Masada del Ratón in Fraga, Palermo and the Cabezo de Monleón in Caspe. From the metallurgical point of view there seems to be a boom given the increase in foundry molds that are located in the populations. The Iron Age is the most important, since throughout the centuries it is the true substratum of the Aragonese historical population. The arrival of Central Europeans during the Bronze Age by Pyrenees until reaching the Lower Aragon area, supposed an important ethnic contribution that prepared the way to the invasions of Iron Age. Ancient history The Mediterranean contributions represented a commercial activity that will constitute a powerful stimulus for the iron metallurgy, promoting the modernization of the tools and the indigenous armament, replacing the old bronze with the iron. There is presence of Phoenician, Greek and Etruscan products. In the 6th century BCE there are six groups with different social organization: Vascones, Suessetani, Sedetani, Iacetani, Ilergetes and Citerior Celtiberians. They are Iberized groups with a tendency towards stability, fixing their habitat in durable populations, with dwellings that evolve towards more enduring and stable models. There are many examples in Aragon, among which Cabezo de Monleón in Caspe, Puntal of Fraga, Roquizal del Rullo or Loma de los Brunos. The type of social organization was based on the family group, consisting of four generations. Self-sufficient societies in which the greater part of the population was dedicated to agricultural and livestock activities. In the Iberian scope the power was monarchical, exercised by a king; there was a democratic assembly with participation of the male population. There were visible social differentiations and established legal-political statutes. The Romans arrived and progressed easily into the interior.