This article details the first unambiguous evidence for occupation in the Late Iron Age, dating to around 10 b.c.-a.d. 25, at the site that was to develop into the Roman Palace at Fishbourne (near Chichester, Sussex). The collection of sealed and well-dated imported and local pottery, accompanied by food refuse and a copper-alloy scabbard fitting, suggests significant activity at the site a generation prior to the Roman Conquest of a.d. 43. The material was found in the bottom of a ditch that had been deliberately back-filled. As such this discovery opens a new chapter in the remarkable story of Fishbourne.