Great topic! I have actually done quite a bit of research on the Iberian Penninsula (Spain and Portugal) recently.
Prior to the Carthaginians and Romans there were several intersting groups known to have occupied Iberia. A group known as the Celtiberians were what modern scholars believe were a loosely related group that were a mixture of Celtic and a pre-Indoeuropean population. There are a number of tribal names offered in classical writings.
These groups mingled into the penninsula during the bronze age and as stated before were a mixed race. They are responsible for constructing what are referred to by archaeologists (and dervived from Caesar's use of the term) as oppida and are widely known as hill forts. These oppida were typically built on hilltops and/or along strategic river and sea routes.
Later conflicts between these varied groups were overshadowed by warefare with Carthage, Ionic Greek colonists, and Rome shaped the culture and development of this group. Another related group, also listed by Roman writers as one of the tribes of Iberia are the Tartesseans who controlled maritime traffic and commerce from the Atlantic into the Mediteranean. Their culture appears to be related to the archaeological site located in the Spanish southwest in a region known as Andalusia. They were responsible for mining operations and trade of the ore with the Phoenicians and led to eventual Phoenician colonization. Although some scholars disagree on the spirit in which the Phoenicians arrived on the scene--as colonizers, conquerors, or for purely trade. Of course their evolution eventually merged with a Phoenician political refuge on the shores of north Africa, a small city named Carthage to escape political persecution from the invading Assyrian Empire in the East, where the final independent Phoenician city of Tyre had at last fallen to decades of siege warfare.
This led to the Carthaginian era in Iberia and brought the penninsula's inhabitants more into the Mediteranean world. Successive territorial disputes with Greek colonists and Rome brough those cultural and economic influences into the region culminating in the Punic Wars and the Roman period that lasted until the dissintegration of the Western Roman Empire and the Visigothic era of the Early Medieval period.
I would say that the classical period of Spain and Portugal involved the Celtiberians, and in specific in earlier times the Tarteseans in the extreme south west corner of the penninsula and whom founded the city Gadir, (known today as Cadiz). Later on the Lusitanians along the western coast (modern Portugal), and the Asrures that fought a series very successful and bitter guerilla wars with the Roman Republic and was later the staging area for Caesar before he took command in Gaul.
I have furnished a list of books that might help further enlighten about Iberian prehistory and its place in the Classical World.
For Iberian prehistory refer to the following:
1. Castro, M.C.F. Iberian Prehistory. Blackwell Press, 1995.
2. Harrison, R.J. Spain at the Dawn of History. Thames and Hudson, Ltd., 1988.
For Celtic influence refer to the following:
1. James, S. The Atlantic Celts . The University of Wisconsin Press, 1999. (More to do with the question of ethnic identity but has wide-ranging impact on Celtic research in Euope as a whole.)
2. Maier, B. (translated by K. Windle). The Celts . The University of Notre Dame Press, 2003.
3. Rankin, H.D. Celts and the Classical World. Areopagitica Press, 1987.
4. Ellis, P.B. The Celtic Empire. Carroll & Graf Publishers, 2001.
And for information on the Greeks and Phonecian/Punics in the regions refer to:
1. Cunliffe, B. The Extraordinary Voyage of Pytheas the Greek. Walker & Company, 2002. (personally, a favorite topic)
2. Hodge, A.T. Ancient Greek France . University of Pennsylvania Press, 1999.
3. Carpenter, R. Beyond the Pillars of Heracles. Delacorte Press, 1966. (A very good resource regarding ancient sea explorers, including Pytheas of Massalia)
4. Aubet, M. E. The Phoenicians and the West. 2nd Ed. Cambridge University Press, 2001. (This follows the evolution of the Phoenician politico-economic growth and the eventual colonization of the west, including Sicily, north and west Africa, and Iberia).
Thanks for the forum to share this information!
Joel (Pytheas)