A long‐distance copper alloy trade to the North Eastern Baltic during the late pre‐Roman and Roman Iron Age (250 BCE–450 CE) explored with lead isotope MC‐ICP‐MS.

The North Eastern Baltic has no copper resources of its own, meaning that Cu alloy was imported either as raw material or as finished objects. The north‐eastern coastline of Estonia during the late pre‐Roman and Roman Iron Age was connected to the south by sea to the long‐distance 'amber' trade route and to the east by Russian river systems. This study quantitatively assesses the direction of the Cu alloy supply in the region before and after brass enters circulation at the beginning of the Roman Iron Age. After an initial portable X‐ray fluorescence (pXRF) survey, 18 objects were chosen for Pb isotope analysis. This isotope analysis resolved a group of nine brass artefacts from the Roman Iron Age amongst a 'melting pot' of other Cu alloys. The similarity between the isotope ratios found in the Roman world suggests the presence of the same 'melting pot' in the North Eastern Baltic, possibly created by a large amount of Roman Cu alloy being traded north. No evidence for Cu alloy from Scandinavia or the Ural Mountains could be found. The hypothesis from this small study is that the Cu alloy entering Estonia was dominated by metal from Southern Europe from the late pre‐Roman Iron Age and the Roman period. [ABSTRACT FROM AUTHOR]