Lifespan: 15xx to 6/19 of Keichō 6 (1601)
Other Names: Kyūgorō, Kii-no-kami
Rank: bushō, daimyō
Title: Junior Fifth Rank, Governor of Kishū (Kii)
Lord: Toyotomi Hideyoshi → Toyotomi Hideyori
Father: Ishikawa Mitsushige
Wife: [Formal] Daughter of Azai Iiyori, [Consort] Okame-no-kata (daughter of the Shimizu clan of the Iwashimizu-Hachiman Shrine)
Children: Mitsutada, Kiyohira, Keikōin (wife of Wakizaka Yasumoto)
Ishikawa Mitsumoto served as a bushō and daimyō during the Azuchi-Momoyama period. Mitsumoto served as a official in the Toyotomi administration.
Mitsumoto was born as the son of Ishikawa Mitsushige. He served under Toyotomi Hideyoshi and led a unit of umamawari, or mounted cavalry.
In 1577, Mitsumoto was granted a fief of 10,000 koku and became the lord of Tatsuno Castle in Harima Province. In 1590, Mitsumoto served in the Conquest of Odawara and, in 1593, served in Nagoya Castle in Hizen Province during the Bunroku Campaign on the Korean Peninsula. He was stationed with the Sannomaru cavalry unit assigned to security.
In the first month of 1595, Mitsumoto and Kinoshita Nobushige served as guards at the Fukushima lodge at the Kusatsu hot springs for Hideyoshi. On 11/2 of Bunroku 4 (1595), Mitsumoto was conferred the title of Junior Fifth Rank (Lower) and Governor of Kishū (Kii Province).
In the wake of the death of Hideyoshi in the eighth month of 1598, Mitsumoto received 15 gold pieces as a keepsake. In 1600, at the Battle of Sekigahara, Mitsumoto served in the Western Army and, owing to their defeat, his territory was seized. Through the offices of Tōdō Takatora, his life was spared. Mitsumoto died on 6/19 of Keichō 6 (1601).
A consort of Mitsumoto named Okame-no-kata, a daughter of the Shimizu clan of the Iwashimizu-Hachiman Shrine in Kyōto, bore a son named Ishikawa Mitsutada. Owing to the jealousy of Mitsumoto’s formal wife from the Azai clan, Okame-no-kata soon returned to her family home. Thereafter, Okame-no-kata served in the entourage of ladies for Tokugawa Ieyasu, becoming one of his consorts and giving birth to Matsudaira Senchiyo and Tokugawa Yoshinao, the lord of the Owari domain. Owing to this connection, Mitsutada was engaged in service by Yoshinao with a fief of 10,300 koku in the Owari domain, becoming a senior retainer.