Iberians

The Iberians were an ancient people who populated pre-Roman Spain and are of unknown ethnic origins. They were once thought to be culturally deviated from the Celtic peoples but that theory has since waned. One fantastical belief about their origins is that the Iberians may be descendants of the survivors of Atlantis! 
The Iberians are the principle ancestors of the modern Spanish people. The modern Chapter of Santiago de Camino is a Christianized-version of an earlier Chapter that developed around the Iberians. 
=== References: ===
-https://en.wikipedia.org/wiki/Iberians
-http://www.spainthenandnow.com/spanish-history/the-iberians-in-spain/default_34.aspx