They held most of Asia Minor, modern Iraq, modern Iran, Afghanistan, Pakistan, Tibet, parts of India, parts of Burma, all of China, and parts of Vietnam. At its height, their empire stretched from Korea across Asia and into European Russia to the Baltic Sea coast.
At the beginning of the 13th century, the Mongol clans became united under Temujin who later became known as Genghis Khan following a campaign of foreign conquest of more developed and technologically advanced civilizations across East Asia, Europe, and the Middle East. They were fierce warriors who are known for establishing the largest contiguous overland empire in human history. The Mongols were a collection of nomadic tribes from the steppes of East-Central Asia and Siberia. The Mongols are an East Asian civilization in Age of Empires II.
The Mongols' civilization music theme in the Definitive Edition