Ikeda Terumasa (池田 輝政, January 31, 1565 – March 16, 1613) was a Japanese daimyō of the early Edo period.

[1] Then later in 1580, during the Siege of Hanakuma castle, they camped at Kitasuwagamine,[2] and on March 2, Terumasa performed notable action where he personally killed six enemies during the battle.

[2] In 1584 on April 9, during the Battle of Nagakute, Terumasa served under the Ikeda Tsuneoki and Mori Nagayoshi who commanded 3,000 and 2,000 soldiers respectively.

In 1594 Terumasa married one of Tokugawa's daughters, and after Hideyoshi died in 1598, the Ikeda drifted into Ieyasu's camp.

As for his duties regarding the dispatch of troops to Korea, Terumasa was ordered to build large ships and transport provisions and rice to Nagoya Castle.

[7] According to popular theory In 1598 after the death of Toyotomi Hideyoshi, the government of Japan have an accident when seven military generals consisted of Fukushima Masanori, Katō Kiyomasa, Ikeda Terumasa, Hosokawa Tadaoki, Asano Yoshinaga, Katō Yoshiaki, and Kuroda Nagamasa planned a conspiracy to kill Ishida Mitsunari.

However, Mitsunari learned of this through a report from a servant of Toyotomi Hideyori named Jiemon Kuwajima, and fled to Satake Yoshinobu's mansion together with Shima Sakon and others to hide.

[8][13] Muramatsu Shunkichi, writer of "The Surprising Colors and Desires of the Heroes of Japanese History and violent womens”, gave his assessment that the reason of Mitsunari failure in his war against Ieyasu was due to his unpopularity among the major political figures of that time.

[7] In August 21, the Eastern Army led by Terumasa Ikeda, began crossing the river from Kawada.

By the time of Terumasa's death in 1613, the Ikeda had grown to rule over Harima, Bizen, Inaba, and Awaji, with a combined income of around 1,000,000-koku.