International audience ; At the crossroads of the Germans, the Celts, the Belgians and the Britons, Belgic Gaul was a place for contacts and exchanges between different protohistoric cultures. Numismatic data shed light on these interactions. In particular, the study of gold coins minted between the Seine and the Rhine reveals a variety of phenomena, from the imitation and the appropriation of foreign monetary types to the earliness and importance of the diffusion ofgold currencies. Monetary typology allows evaluation of this ‘crossroads situation’. Indeed, the majority of gold coins minted in Belgic Gaul reproduce and adapt a particular iconography, the so-called ‘Gallo-Belgic type’, which appeared at first simultaneously in the Somme Valley and the Moselle Valleyand which was spread by the end of the 2nd century BC. Alongside the internal exchanges in Belgic Gaul, there is also the influence of external coinages – Germanic, Armorican, Roman –, which results in the use of specific typological elements. Moreover, the Belgic currencies and type were spread to the margins of the studied region, i.e. in Britain and, even, into the territory of the Parisii. The new data collected from the elementary analysis ofcurrencies, in particular the observation of platinum and palladium concentration, allow the identification of several chemical signatures, which could correspond to metal stocks. According to this method, it seems possible to trace their spread, which does not appear confined to Belgic Gaul. Thus, one can hypothesize that several gold stocks were used during the 1st century AD. Furthermore, it appears that monetary typology of the region betweenthe Seine and the Rhine can only be understood in the light of its interactions with other European cultures. ; Au croisement des Germains, Celtes, Belges et Bretons, la Gaule Belgique constituait comme un espace de contacts et d’échanges entre différentes cultures protohistoriques. Les données numismatiques permettent d’éclairer ces interactions. En particulier, ...