Yamaguchi Hida-no-kami served as a bushō during the Sengoku period. He was a retainer of the Oda clan and, later, the Tokugawa clan. His real name is unknown.
Hida-no-kami began as a servant of Oda Nobunaga and, in the early Eiroku era (1558 to 1570), he became a member of the elite cavalry known as the akahoroshū who rode with red capes that filled with air to deflect arrows or other objects hurled at them in battle.
In 1569, at the Siege of Ōkawachi Castle in Ise Province, Hida-no-kami, Yoshiyuki, and others served as members of the group of hatamoto responsible for defending the main base and managing limited construction work.
Thereafter, he incurred the ire of Nobunaga and, together with Kyōsuke, Yoshiyuki, and Yasaburō, absconded from the Oda family. They turned themselves over to the remit of Tokugawa Ieyasu. Their treatment at this time is unknown, but, on 12/22 of Genki 3 (1573), Hida-no-kami participated in the Battle of Mikata-ga-hara and, together with the others in his group, was killed in action.
According to one account, when Nobunga’s younger brother, Oda Nobukatsu, was murdered, Hida-no-kami was the first among three individuals to cut him, but there is no reference to this in the authenticated biography of Nobunaga known as the Shinchō-kōki, so the details are uncertain. In some views, this is an error.