This paper presents the results of recent geophysical survey work in the vicinity of the Roman town of Isurium Brigantum (Aldborough, North Yorkshire). It combines results from research projects with information from developer-funded work to assess the nature of settlement in the area at the time of the foundation of the Roman town and through the period of its use. The work confirms that there was no major pre-Roman Iron Age centre in the area at the time of Roman annexation. It does, however, provide new evidence to show that the landscape was heavily exploited and occupied by rural settlements. The evidence revealed suggests that Iron Age society in this area may have been heterarchical.