Polybius in a familiar passage, lists goods moving past Byzantium between the Mediterranean. world and the Black Sea region; among these goods, slaves are accorded a prominent place: …as regards necessities it is an unidsputed fact that the most plentiful supplies and best qualities of of cattle and slaves reach us from the countries lying round the Pontus, while among luxuries the same countries furnish us with an abundance of honey, wax and preserved fish; from the surplus of our countries (...) they take olive-oil and every kind of wine. As for grain, there is give and-take – with them sometimes supplying us when we require it and sometimes importing it from us. (shrink)