A drachma was a type of Greek currency. In 64 Byzantium, Barbara Wright held a clay ornament, which she called a Greek urn. She went on to joke that, if Ian were to say "What's a Greek earn? Ten drachmas a week" he'd get "such a thumping".
The Greek bread stall owner of this time , Nikos told Ian Chesterton that the four pita bread pieces he wished to buy would cost any of three obols, one drachma, one sestertius or one half shekel. Ian paid him with a sestertius. Later, Niko would give Daniel change of one drachma for his purchase. (PROSE: Byzantium!)