Joining the evangelists on these routes across Asia were military leaders, merchants and learned men. Modern Chinese words derived from Persian and Arabic, such as bosi, meaning a precious object (literally “from Persia”), are evidence of the booming markets and wealth in the Muslim world in the early Middle Ages, as vast tax revenues flowed towards Baghdad and the great cities of Mesopotamia and central Asia. Scholars were drawn by systems of patronage that gathered the best minds to work on pure and applied mathematics, science, optics and medicine, while great craftsmen found an insatiable demand for their wares. A place such as Rayy, not far from modern Tehran, was so glorious as to be considered “the bridegroom of the earth”. Cities, strung like pearls across the spine of Asia, flourished long after the discovery of the Americas: the moment usually presumed to have marked the true start of the ascent of the West.
Peter Frankopan on the silk road (New Statesman)