Mongols

From Conservapedia

The Mongols are an ethnic group that originated in modern day Mongolia, Russia, and China. They successfully invaded and controlled much of Asia, including all of China, parts of Russia, and most of the Middle East during Medieval Times. At the height of their empire they controlled 22% of the Earth's total land area around 12,741,000 square miles. Given their size they were the world's second largest empire ever to exist right behind Great Britain and the world's largest Contiguous empire ever 6 times the size of the Roman Empire.