Ishida Mitsunari was a prominent samurai and military leader during Japan's late Sengoku period. Born in 1560, he served as a loyal retainer to Toyotomi Hideyoshi, one of Japan's most powerful unifiers. Mitsunari is best known for his role in the Battle of Sekigahara in 1600, where he led the Western Army against the Eastern Army led by Tokugawa Ieyasu. After the defeat at Sekigahara, Mitsunari was captured and executed in 1600. His death marked the end of the Toyotomi clan's power and the rise of the Tokugawa shogunate, which would rule Japan for over 250 years. Mitsunari is often remembered for his loyalty and strategic mind in the tumultuous era of feudal Japan.