The author of Travel Around the World is Umari, the minister of Mamailiuke Dynasty. Besides a brief history from Alanguo, the ancestor of Genghis Khan, to Sun Tiemu, the Taiding Emperor of the Yuan Dynasty, it also recorded the situation of Kuotai, Chahetai and Shu Chi and their relationship with the Yuan Dynasty. This book is a precious historical material for studying Mongolian history and Yuan history.
Wang Dayuan, a famous traveler in Yuan Dynasty, went to sea with merchant ships and traveled to dozens of countries such as China and Africa. After returning home, he wrote a book "Introduction to Island Planning" to record what he saw and heard. It is recorded that Bangalore, located near the east coast of Africa, is now Zanzibar.