Foreign Devils on the Silk RoadThe Silk Road, which linked imperial Rome and distant China, was once the greatest thoroughfare on earth. Along it travelled precious cargoes of silk, gold and ivory, as well as revolutionary new ideas. Its oasis towns blossomed into thriving centres of Buddhist art and learning. In time it began to decline. The traffic slowed, the merchants left and finally its towns vanished beneath the desert sands to be forgotten for a thousand years. But legends