Regarding Genghis Khan Hollywood made two movies on him, possibly the two worst cast movies of all time.
1. John Wayne as Genghis Khan
https://en.wikipedia.org/wiki/The_Conqueror_(1956_film)
2. Omar Sharif as Genghis Khan
https://en.wikipedia.org/wiki/Genghis_Khan_(1965_film)
Genghis Khan created in 25 years a larger empire than the Romans did in 400 years.
Where was Yul Brenner (sp?) at that time?