Oktadrachm

The Bisaltai were a Thracian tribal people whose territory sat squarely in the path of Xerxes' invasion route into Greece in 480 BC. Their silver coinage — among the heaviest struck by any Thracian tribe — drew directly on the rich mines of the Strymon basin, the same regional silver sources that funded Athenian naval expansion during this exact decade. The oktadrachm standard itself was common among Macedonian and Thracian tribes of the period, a weight convention that had no Greek polis equivalent and reflects independent monetary tradition rather than imitation.

The tribe disappears from historical record after the mid-fifth century, absorbed into the expanding Macedonian sphere under Alexander I.