Kagemusha (1980)

In 1572, there is a civil war in Japan, and three powerful clans, leaded by the lords Shingen Takeda (Tatsuya Nakadai), Nobunaga Oda (Daisuke Ryu) and Ieyasu Tokugawa (Masayuki Yui), dispute the conquest of Kyoto. When Shingen is mortally wounded, the Takeda clan hides the incident and uses a poor thief to be the double of the strategist Shingen and keep the respect of their enemies. Along the years, Kagemusha incorporates the spirit of the warrior of the dead warlord.