Akira Kurosawa
A petty thief with an utter resemblance to a samurai warlord is hired as the lord's double. When the warlord later dies the thief is forced to take up arms in his place.
When a powerful warlord in medieval Japan dies, a poor thief recruited to impersonate him finds difficulty living up to his role and clashes with the spirit of the warlord during turbulent times in the kingdom.