The tetradrachm was an Ancient Greek silver coin equivalent to four drachmae. It was in wide circulation from 510 to 38 BC. Many surviving tetradrachms were minted by the polis of Athens around the middle of the 5th century BC; the popular coin was widely used in transactions throughout the ancient Grecian world, including in cities politically unfriendly to Athens. The Athenian tetradrachm was stamped with the image of an owl, the iconographic symbol of the Athenian polis. To differentiate the… (More on Tetradrachm)