Great progress has been made in our understanding of the circulation of Celtic coinage in the last 15 years. Not only has the number of findspots been greatly increased, the coins have also more often been placed in their archaeological context. We can now distinguish different modes of circulation; some emissions are very local in character, others remain within the territory of a tribe, while some have a supra-regional distribution. Thus monetary usage can vary from region to region, but there can also be similarities which shift through time. Given the present state of documentation, it is difficult to define the function of coinages precisely. Nevertheless, when we compare distribution maps of single finds and of hoards, their composition and their archaeological contexts, then we can start to comprehend the complexity of monetary usages at the end of the Iron Age. This in turn raises the question of the multiplicity and the hierarchisation of the issuers of coins.