While little can be seen today in Marvão of this period, tradition states that the large herding dogs of Iberia were introduced by the Alans: (Portuguese mastiffs can be seen guarding livestock in fields around Marvão, while the bulky Alano Espãnol was used in Spanish bullfights).
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The migration of the Celtici is considered part of a third or fourth wave of Celts in the 4th century BCE: this migration occurred across modern-day Aragon and into modern-day Extremadura and Alentejo, displacing the proto-Celt Lusitanians who dominated the lands north of the Tagus, and skirting the Vettones lands that stretched from Zamora to Castelo Branco.