Sandi Toksvig on the real-life heroines that have inspired her (in The Guardian):

The niece of the great Mongol leader, Kubla Khan, Princess Khutulun was described by Marco Polo as the greatest warrior in Khan’s army. She told her uncle she would marry any man who could wrestle her and win. If they lost they had to give her 100 horses. She died unmarried with 10,000 horses.