The Valley of the Ebro, in spite of having a mountainous barrier by the north, by the south has been open to all type of influences. The presence in the valley had to begin about 100,000 years ago.	Illustration of crómlech
In so expanded prehistoric period, it is logical to find different phases in the way to live and to organize themselves of the primitive towns of the Iberian Valley. Even when are not rest, the reconstruction of the culture is made in analogy with similar cultures.

Paleolithic.

The first human rest appear in the Paleolithic, one of the most sparing periods in archaeological rest, which forces to speak to us by simple conjectures. In this period the man lives in caves. He does not dominate the sources of food production, eats and he uses what spontaneously he lends the nature to him. During the periods of the Inferior and Average Paleolithic, it belongs to the Neanderthal species and their rest are a limited arsenal of instruments of stone carved and in general of great size.
Partly of the creek have not been rest but, since this serious zone a rich zone in food and resources, could not be denied at least the passage of these settlers by this zone. The settlers of the inferior Paleolithic were hunters and recolectores seminomads who lived in the terraces of the rivers. On the Superior Paleolithic more objective data are not controlled either, although have been rest in Aragón, vital for the study of the cave painting in these earth. The Superior Paleolítico extends a new homínido type, the Cromagnon. These men, practically equal to the present human being, live in caves, where they bury to deads and they paint in his walls. Towards the 10,000 b.C. (Epipaleolithic) a change in the rock art takes place. The call extends in Aragón "levantino" art. Animal figures (bulls, goats, horses and wild boars) and human are conserved of this period in many Aragonese rocky shelters, located in Caspe.	Illustration of a red deer or goat
After the Paleothic, the culture of the man of the mesolithic is developed in our earth between years 7,000 and 4,000 before Christ. This new stage begins with the retirement of the ice towards the north of Europe. Retiring the great prey of which those men nourished themselves, adapting their diet with small animals and even worms. Their equipment remain being of sílex but their dimensions are reduced.

Neolithic

The man of Neanderthal is partly extinguished, due to the influence of the Sapiens Sapiens (the present human) and his use of the Neandertahl like part of his diet.

In this time the man still does not know the writing, but for that reason its culture does not let have importance within the evolution. The man begins to control the forces of the nature aside from discovering the agriculture and the cattle ranch, that sedentarizan to the man, since now it has something to defend and to keep from other tribes who did not have these knowledge.

He is born the pottery, the basketwork, the weave, the face, the town and the urban organization. The neolithic one is a concerned civilization, arrival by the European continent and/or the Mediterranean coasts.

Age of metals.

The revolution will culminate for the first time with the use, of a metal. When this happens is near year 2,100 before Christ. The people of the valley enter themselves in the denominated Age of the Metals, although the use of the stone, single does not disappear that now add equipment made with metals. Of this time one is with ends of arrow of pedúnculo and fins.

When it is begun to alter the copper with a tin alloy says that the age of bronze begins. The culture is modified, the interments even within the same period, are diversified and, while in some zones of Aragón they are used vasijas of mud, in the part of the valley they are buried next to the dead its own one to ajuar allowing to know part its culture.

Age of the bronze.

At this time, the use of this new alloy that it will give him name is extended little by little by the world.

The expansion of the metallurgical technical revolutionary will stimulate the contacts between the populations, arising stable commercial routes. In the ceramics it appears a new form characteristic in bell form: the "campaniforme glass".

The discovered oldest rest in the location of the present city correspond to a small pastoral establishment of around century VII before located Christ next to the Ebro, in the street of the Tomb.

Age of iron.

Towards year 900 before Christ the Average Valley of the Ebro penetrates in the Age of the Iron. During this time an invasion takes place, a colonization of these earth by men of the north, bringing with himself, their culture and modifying ours.

Characterizing to the first age of the iron in our earth, we found certain rest concrete, like the fields of ballot boxes or necropolis in which they appear grouped ashes of the dead, these ballot boxes were placed in stone baskets of reduced size and covered by túmulos of stone.