Then Celts settled in Spain during the Iron Age. Some of those tribes in North-central Spain, who had cultural contact with the Iberians, are called Celtiberians. In addition, a group known as the Tartessians and later Turdetanians inhabited southwestern Spain. They are believed to have developed a separate culture influenced by Phoenicia. The seafaring Phoenicians, Greeks, and Carthaginians successively founded trading colonies along the Mediterranean coast over a period of several centuries. Interaction took place with indigenous peoples. The Second Punic War between the Carthaginians and Romans was fought mainly in what is now Spain and Portugal.