Yesün Temür was a great-grandson of Kublai Khan and an emperor of the Yuan dynasty of China from 1323 to 1328. Apart from Emperor of China, he is regarded as the 10th Khagan of the Mongol Empire, although it was only nominal due to the division of the empire. In Chinese historiography, Yesün Temür, who was very fond of the traditional ways of the Mongols, is commonly known as the Taiding Emperor of Yuan based on his first era name. His name means "nine iron" in the Mongolian language.

Mongolian is the principal language of the Mongolic language family that originated in the Mongolian Plateau. It is spoken by ethnic Mongols and other closely related Mongolic peoples who are native to modern Mongolia and surrounding parts of East and North Asia. Mongolian is the official language of Mongolia and Inner Mongolia and a recognized language of Xinjiang and Qinghai.