320 B.C. Greece Silver Tetradrachm, Alexander the Greatc. 320 B. C. Greece Silver Tetradrachm, Alexander the Great. Moderate wear, strong strike, well centered, dark patch of toning on obverse. 26mm diameter, 17. 1g weight, silver. In 336 B. C., Alexander ascended to the throne of the small kingdom of Macedon in Greece. Less than a decade later, he had conquered half of the known world, building an empire that stretched from Greece all the way to the northwestern corner of India. Poised to invade the