The Iberian peninsula saw migrations of Celtic tribes from central Europe during the 6th–4th century BCE. The site of modern-day Marvão would have stood on the northern periphery of the territory of the Celtici tribe, which stretched from the Tagus to Guadiana rivers, and beyond to the Algarve and today's Huelva province in Andalucia. The area falls within the northernmost limits of the Tartessian paleohispanic language and culture, centred on Huelva in Spain, in decay throughout this period as Celticisation took place.