Lifespan: Tenbun 18 (1549) to 4/29 of Keichō 10 (1605)
Rank: bushō, hatamoto
Lord: Oda Nobunaga → Toyotomi Hideyoshi → Tokugawa Ieyasu
Father: Akai Iekiyo
Mother: Daughter of Nariyoshi Shinzaemon
Children: Tadayasu, Kimio, daughter (wife of Ishikawa Shōjirō), daughter (formal wife of Kawakatsu Shigeuji)
Akai Tadaie served as a bushō in the Sengoku and Azuchi-Momoyama periods and a hatamoto, or direct retainer of the Edo bakufu, in the early Edo period.
Tadaie’s father, Akai Iekiyo, died of injuries sustained in battle when Tadaie was nine years old. Thereafter, he received support from his uncle, Akai Naomasa. In the third month of 1570, his territory was secured by Oda Nobunaga through the mediation of Kinoshita Hideyoshi (later Toyotomi Hideyoshi). Thereafter, he joined the Hatano clan to lead kokujin, or provincial landowner, from Tanba Province in opposition to the Oda. On 8/9 of 1579, an invasion by Akechi Mitsuhide into Tanba led to the Battle of Kuroi Castle and loss of his home base. Tadaie fled to Futamata in Tōtōmi Province.
In 1592, Tadaie served under Toyotomi Hideyoshi in a military campaign on the Korean Peninsula, known as the Bunroku-Keichō Campaign. On 9/2 of 1593, Tadaie was awarded a fief of 1,000 koku in the Minō District of Harima Province. Tadaie had a falling out with Hideyoshi’s younger brother, Toyotomi Hidenaga, causing him to call upon Ōkubo Tadayo to seek a position under Tokugawa Ieyasu. He was ordered to serve his uncle, Yamaguchi Naoyuki in Ashida in Shinano Province. He returned to serve the Toyotomi clan only to leave once again.
In 1600, Tadaie presented to Tokugawa Ieyasu a secret letter addressed to Yatabe Shinzaemon, a retainer of Tadaie and family member of Yatabe Sukebei, a yoriki, or security official, of Ishida Mitsunari. Ieyasu allowed those with wives and children to return to their home provinces, but Tadaie persisted to loyally fulfill his duties, receiving a tea kettle as a symbol of appreciation from Ieyasu. Tadaie participated on behalf of the eastern army at the Battle of Sekigahara. Afterwards, he was awarded a fief of 1,000 koku in the Toichi District of Yamato Province, so that his fief amounted to 2,000 koku in total. In 1605, Tadaie died in the Fushimi District of Kyōto.