What is "pellendones"

The Pellendones (also Pelendones Celtiberorum or Cerindones) were an ancient pre-roman people living on the Iberian Peninsula. From the early 4th century BC they inhabited the region near the source of the river Duero in what today is north-central Spain. The area comprises the north of Soria, the southeast of Burgos and the southwest of La Rioja provinces.