"It was not to be supposed that the shrewd spirit of mercantile enterprise and speculation would remain dormant in this state of affairs. Traders in every part of Europe were alive to the advantages to be derived from the discovery of a new route of transportation. Several efforts were made, and in some cases attended with immense profit and success, to communicate with India by the long and arduous journey round the Black Sea, and through the almost unexplored regions of Circassia and Georgia. The far-off shores of the Caspian were reached by some travelling traders, and the geographical knowledge they circulated on their return gave a new impulse to the growing spirit of adventure. Apocryphal as the narratives of Marco Polo and Mandeville appeared, there was a sufficient mixture of truth with exaggeration to stimulate the minds of men, ever greedy of gain, and the endless wealth of the grand khan and his people were the subjects of many eager and longing anticipations."[7] The Polos were merely the forerunners, the pioneers, to the far Cathay, and in the fourteenth century missionaries and merchants followed on their trail with varying success. The death of Kublai Khan had relieved them from their obligation to return; but soon after they had reached Venice, in 1295, a Franciscan monk, John of Monte Corvino, penetrated to Chambalu and established missions there. In the year 1338 an ambassador arrived at Avignon from the then reigning Khan of Cathay, and in return John de Marignoli, a Florentine, was sent to the court at Chambalu, where he remained four years as legate of the holy see. Commercial travellers followed after them, and about 1340 a guide-book was written by another Florentine, Francesco Pelotti, who was a clerk in the great trading-house of Bardi, or Berardi, with which, at a later date, Amerigo Vespucci was connected in Spain. "When the throne of the degenerate descendants of Ghengis Khan began to totter to its fall, missions and merchants alike disappeared from the field. Islam, with all its jealousies and exclusiveness, had recovered its grasp over Central Asia. Night again descended upon the farther East, covering Cathay, with those cities of which the old travellers had told such marvels, Chambalu and Cansay, Zaitun and Chinkalan. And when the veil rose before the Portuguese and Spanish explorers of the sixteenth century those names were heard of no more....