In this paper we examine the structure of politically complex societies in the north‐east of the Iberian Peninsula during the first millennium BC, using the Lower Ebro region as an example. Drawing on data provided in recent years by archaeological research, we discuss the combination of territorially hierarchical and heterarchical phenomena. At the same time we reassess the chronological framework in which this sociopolitical process took place. To do so, we rely more on information about the evolution of the protohistoric societies in the region under study than on information about material culture. We present a model that may serve as a starting point for future research.