Tartessians were the creators of the Southwestern script, one of the earliest written languages in Europe. A renowned gold hoard from the Tartessian period, the Tesoro de Aliseda was discovered in nearby Aliseda (Cáceres province), while a gold bracelet[15] discovered in nearby São Julião (Portalegre) - sold at auction in 2013 - suggests that local tribes were relatively wealthy. 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.[16]