Pope Innocent IV and King Louis IX "Saint" were very active in establishing ties with the Mongol khans. As a result, two embassies were sent to the Mongols - Plano Carpini and Guillaume de Rubruk, and it was they who brought the first really important geographical information for the whole Middle Ages. In the same XIII century Marco Polo allegedly traveled from Europe to China. This book reveals the great deception of Marco Polo, which was believed by the world public for more than 750 years.Carpini and Rubruk wrote books after completing their missions to the East, but they were little translated into other languages. Meanwhile, the most monstrous lies and nonsense, such as the fabrications of Onesikrit, "The Book of Knowledge", "The Travels of John Mandeville", etc., are immediately taken seriously.The indisputable facts, hypotheses and reasoning in this book are very interesting and aimed at a wide audience of readers, especially students, historians and geographers. Scientists, researchers and those who have a great interest in the history of geography, for them are revealed, some secrets related to the activities of the Venetian merchant.