Most of the Iberian peninsula has been populated since prehistoric times. Early evidence of human habitation unearthed at the Atapuerca site in northern Spain are some 800,000 years old. Modern man made his appearance around 35,000 BC. Sometime around 4000 BC, much of Spain was settled by the Iberians, arriving from the east. The Celts arrived later, settling in the northern third of the peninsula. Bronze age civilization flourished in the south, culminating with the Tartessian civilization around Seville (1000-500 BC).