Battle of Yamazaki: Toyotomi Hideyoshi defeats Akechi Mitsuhide.

The Battle of Yamazaki was fought in 1582 in Yamazaki, Japan, located in current-day Kyoto Prefecture. This battle is sometimes referred to as the Battle of Mt. Tennō.

Toyotomi Hideyoshi , otherwise known as Kinoshita Tōkichirō and Hashiba Hideyoshi , was a Japanese samurai and daimyō of the late Sengoku and Azuchi-Momoyama periods and regarded as the second "Great Unifier" of Japan. Although he came from a peasant background, his immense power earned him the rank and title of Kampaku and Daijō-daijin , the highest official position and title in the nobility class. He was the first person in history to become a Kampaku who was not born a noble. He then passed the position and title of Kampaku to his nephew, Toyotomi Hidetsugu. He remained in power as Taikō (太閤), the title of retired Kampaku, until his death. It is believed, but not certain, that the reason he refused or could not obtain the title of shogun (征夷大将軍), the leader of the warrior class, was because he was of peasant origin.

Akechi Mitsuhide , first called Jūbei from his clan and later Koretō Hyūga no Kami (惟任日向守) from his title, was a Japanese samurai general of the Sengoku period. Mitsuhide was originally a bodyguard of the last Ashikaga shōgun Ashikaga Yoshiaki and later, one of the trusted generals under daimyō Oda Nobunaga during his war of political unification in Japan.