After the Romans had subdued most part of the world, many notable discoveries were made.  But then came the Goths, Moors, and other barbarous nations, who destroyed all A.D. 412, the Goths took the city of Rome.  Thereafter the Vandals went out of Spain, and conquered Africa.  In 450, Attila destroyed many cities in Italy, at which time Venice began; and in this age the Franks and Vandals entered into France.  In 474, the empire of Rome was lost, and fell from the Romans to the Goths.  In 560, the Lombards came into Italy.  About this time the sect of the Arians prevailed greatly, and Merlin the English prophet flourished.  In 611, the Mahometan sect sprung up, and the Moresco government, which invaded both Africa and Spain.  By this it may appear that all the world was in a state of war, and all places so very tumultuous, that traffic and merchandize ceased, no nation daring to trade with another by sea or land; nothing remaining stedfast, neither in kingdoms, signories, religions, laws, arts, sciences, or navigation.  Even the records and writings of these things were burnt and destroyed by the barbarous power of the Goths, who proposed to themselves to begin a new world, and to root out the memory and knowledge of all other nations.

Those who succeeded in the government of Europe, perceiving the great losses of the Christian world by want of traffic and the stoppage of navigation, began to devise a way of passing into India, quite different from the route of the Nile and the Red Sea, and much longer and more costly[41].  The goods of India were brought up the river Indus as far as it was navigable.  They were then carried by land in caravans through the country of Parapomissus into the province of Bactria, and shipped on the river Oxus, which falls into the Caspian, and thence across that sea to the haven of Citracan, or Astracan, on the river Rha, or Volga.  Thence up that river, and to the city of Novogrod, in the province of Resan, which now belongs to the great duke of Muscovy, in lat. 54 deg.  N. The goods were carried thence overland to the province of Sarmatia and the river Tanais or Don, which is the division between Europe and Asia.  Being there loaded in barks, they were carried down the stream of that river into the Paulus Maeotis to the city of Caffa, anciently called Theodosia, which then belonged to the Genoese, who came thither by sea in galliasses, or great ships, and distributed Indian commodities through Europe.

In the reign of Commodita, emperor of Armenia, a better course was provided for this traffic:  The goods being transported by land from the Caspian, through the country of Hiberia, now Georgia, and thence by the Phasis into the Euxine, and to the city of Trebisond, they were thence shipped for the various parts of Europe[42].  It is recorded that Demetrius Nicanor determined, or actually began, to open a canal of above 120 miles in length between the Caspian and Euxine, for the greater convenience of the Indian trade.  But he was slain by Ptolemy Ceraunos, and this famous enterprize fell to nothing[43].