was a Japanese daimyō of the early Edo period. His court title was Musashi no Kami. Terumasa was also known by the nickname saigoku no shōgun, or, "The Shōgun of Western Japan". Terumasa fought in many of the battles of the late Azuchi–Momoyama period, and due to his service at the Battle of Sekigahara, received a fief at Himeji. His childhood name was Araokojimaru (荒尾古新丸). He was the son of Ikeda Tsuneoki and brother of Ikeda Sen.

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was a Japanese daimyō of the early Edo period. His court title was Musashi no Kami. Terumasa was also known by the nickname saigoku no shōgun, or, "The Shōgun of Western Japan". Terumasa fought in many of the battles of the late Azuchi–Momoyama period, and due to his service at the Battle of Sekigahara, received a fief at Himeji. His childhood name was Araokojimaru (荒尾古新丸). He was the son of Ikeda Tsuneoki and brother of Ikeda Sen. Biography Terumasa was the 2nd son and heir of Ikeda Nobuteru, Terumasa held Ikejiri Castle (Mino Province) and joined his father in fighting for Hideyoshi in the Battle of Komaki and Nagakute 1584, he led troops at Nagakute, the battle in which his father was killed. In 1590, following the transfer of Tokugawa Ieyasu to the Kanto, Terumasa was established at Yoshida in Mikawa, a 152,000-koku fief. In 1594 Terumasa married one of Tokugawa's daughters, and after Hideyoshi's death in 1598, the Ikeda drifted into Ieyasu's camp. When the Sekigahara Campaign began in the fall of 1600, Terumasa immediately sided with his father-in-law, Tokugawa. On 28 September he competed with Fukushima Masanori to be the first to attack Gifu Castle, held by Oda Hidenobu. At the Battle of Sekigahara, Ikeda commanded 4,560 troops in the rear guard and saw some desultory fighting with Chosokabe Morichika's contingent as the battle wound down.

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