Mongolian princess Kublai Khan only accepted to marry her wrestler in the 13th century.

Kublai Khan is a bit of Genghis Khan, the daughter of Hai Do, the Han (head) of the Huayai Khanate, was once considered part of the Mongol empire (existed between 1206-1368).

Born around the year 1260 and raised with 14 brothers, Kublai Khan is very good at horseback riding, archery and wrestling.

Kublai Khan poses a special request to those who want to marry her: they must defeat the princess in a wrestling match.

There was a guy who was so confident that he bet 1,000 horses to challenge Kublai Khan.

Kublai Khan in the end did not choose her husband through wrestling.

Hai Do died in 1301. He wanted Kublai Khan to become his successor, but was opposed by his sons.

Hop Thoc Luan is believed to be the inspiration for one of the most famous operas: Turandot by renowned composer Giacomo Puccini.

Today, wrestling, horseback riding and archery are still the national sports of Mongolia and they are held every summer at the Nadaam festival.

Mongolia has internationally famous wrestlers, but the common thing about Mongolian wrestlers is that they are all men.

However, Jack Weatherford, a professor of anthropology at Macalester University, in the US thinks that the actions of modern wrestlers show that they acknowledge the history of female wrestlers.

"Wrestlers wear special shirts with long sleeves but do not cover their shoulders and the front body is completely exposed, as a way of showing their opponents that they are men. At the end of each match, the winner hides.

"It was a dance to celebrate victory, but it was also how they honored the greatest female 'athlete' in Mongolian history, the wrestling princess that no man has ever beat," said Weatherford.