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Ancient brass (aurichalcum) was a valued commodity in the Antiquity, notably because of its gold-like appearance. After mastering brass fabrication using the cementation procedure in the 1st century BC in the Mediterranean, this material became widely used by the Romans for coins, jewellery and other objects. Because of its visual qualities, it is believed that since this period, brass played an important role in diplomatic and economic contacts with indigenous communities, notably Celtic and Germanic tribes north of Danube and west of Rhine. To test this hypothesis, we performed for the first time the archaeometric and advanced statistical multivariate analysis of a suite of late Iron Age and Early Roman period (1st century BC – 1st century AD) brass and other copper-alloy objects from the territory of Bohemia to constrain their provenance. The new results for brass objects from this early phase of the massive occurrence of Roman aurichalcum in the Barbarian territories point to the ore deposits in the western Mediterranean or the Massif Central area in Gaul, consistent with historical events. These new findings underscore the great economic and political importance of the new and rich mineral resources in the Transalpine Gaul acquired due to Caesar's military campaigns