Lifespan: Tenbun 15 (1546) to 5/7 of Keichō 20 (1615)
Title: Junior Fifth Rank (Lower), Master of the Stables
Clan: Itami → Kōri
Lord: Araki Murashige → Toyotomi Hideyoshi → Toyotomi Hideyori
Father: Itami Chikayasu
Adoptive Father: Kōri Masanobu
Siblings: Muneyasu, sister (wife of Katō Shigenori), sister (wife of Yoda Shigemasa)
Children: Fuji (consort of Hosokawa Tadaoki, Matsunomaru), Keijuin (fourth daughter, wife of Kimura Ise-no-kami → wife of Mitsubuchi Mitsuyuki), others
Kōri Muneyasu served as a bushō from the Sengoku to early Edo periods. He was a retainer of the Toyotomi clan.
In 1546, Muneyasu was born as the son of Itami Chikayasu. He was adopted by his uncle, Kōri Heidayū Masanobu and adopted the Kōri surname.
Initially, Muneyasu served Araki Murashige of Settsu Province, but, after the fall of Murashige, served as a member of the umamawari, or cavalry, for Toyotomi Hideyoshi. He was awarded a fief of 3,000 koku in the Nakamura District of Settsu and the Kani District of Mino Province. In 1590, in the Conquest of Odawara led by Hideyoshi to subdue the Gohōjō clan of Sagami Province, Muneyasu joined Katagiri Katsumoto to attack castles in the eastern districts of Kōzuke Province. In 1593, for the Bunroku Campaign on the Korean Peninsula, Muneyasu served in Nagoya in Hizen Province as an inspector of ships of various commanders to transport military provisions. In the ninth month of 1597, Muneyasu was invested with the title of Junior Fifth Rank (Lower) and Master of the Stables. Muneyasu further received the Toyotomi surname. In the ninth month of 1600, at the Battle of Sekigahara, he joined the Western Army and participated in the Siege of Ōsaka Castle.
Thereafter, Muneyasu served Hideyoshi’s son, Toyotomi Hideyori, as a hatabugyō or soldier in charge of the battle flags on the battlefield. On 12/21 of Keichō 19 (1614), Muneyasu, together with Kimura Shigenari, served as representatives of the Toyotomi at the encampment of Tokugawa Hidetada to obtain a written settlement. At the Summer Campaign of Ōsaka, after a defeat at the Battle of Tennō Temple and Okayama, Muneyasu attempted to take his own life, but found it against his conscience to hand-over the flag to enemy soldiers so he returned to Ōsaka Castle. On 5/7 of Keichō 20 (1615), he killed himself during a loss by the Toyotomi army.
His fourth daughter, Keijuin, first wed Kimura Ise-no-kami (a retainer of Akechi Mitsuhide) and took into her care the child of Kayano Yasōzaemon Nagamasa (a retainer of the Toyotomi). This boy later served the Kuroda clan and adopted the name of Kōri Shōdayū Yoshinari. Later, she wed Mitsubuchi Mitsuyuki and bore three sons, and the second son was named Kōri Fujimasa.