2 films match Kagemusha

In 16th-century feudal Japan, a petty thief facing execution is spared because of his uncanny physical resemblance to a powerful warlord. When the ruler is mortally wounded in battle, the thief is forced to impersonate him to maintain political stability and deter enemy clans. He must navigate the dangerous deception while convincing the army and rival clans that the leader is still alive.

A peasant ascends to the nobility, only to be destroyed in the process. (Criterion)