 Wine historians have theorized that the Greeks may have introduced viticulture to Spain and Portugal, but competing theories suggest that the Phoenicians probably reached those areas first.The grape clusters, vines and wine cups that adorn Greek coins from classical times bear witness to the importance of wine to the ancient Greek economy.With every major trading partner, from the Crimea, Egypt, Scythia, Etruria and beyond, the Greeks traded their knowledge of viticulture and winemaking, as well the fruits of their own production.