This book is an introduction to coinage of the Mongol Empire during its westward expansion through Central Asia, the Volga regions and the Crimea under the leadership of Chingiz (Genghis) Khan's oldest son Jochi. These lands eventually came to be ruled independently by Jochi's descendants as the Ulus Jochi, known in later times as Jochids, Jujids or the Golden Horde. Most of the early coins of Central Asia in the book are new discoveries only recently published in the Russian literature. The authors have attempted to relate the coinage to the historical context in which it was issued and to provide an overview of the westward expansion itself. The Golden Horde are the Mongols who were in Russia for two centuries and who had an indelible influence on the future development of the Russian Empire.