Background
Yuki Hideyasu was born on March 1, 1574 in Hamamatsu, Shizuoka, Japan. He was the second son of Ieyasu Tokugawa. He was adopted by Hideyoshi Toyotomi.
秀康 結城
Yuki Hideyasu was born on March 1, 1574 in Hamamatsu, Shizuoka, Japan. He was the second son of Ieyasu Tokugawa. He was adopted by Hideyoshi Toyotomi.
Coming of age while living with Hideyoshi, Ogimaru was given the name Hashiba Hideyasu, which combined the names of his adoptive father and biological father. He was also granted courtesy title of Mikawa-no-kami, and his Court rank was Senior Fifth Rank, Lower Grade, raised to Ukonoue-gon-shōshō and Senior Fourth Rank, Lower Grade in 1585.
Hideyasu took part in his first campaign during the Kyūshū Campaign of 1587, leading the assault on Buzen-Iwaishi Castle. He also received honors for his distinction in the pacification of Hyūga Province. Hideyasu also took part in the Siege of Odawara (1590) and the Japanese invasions of Korea (1592-1598). His successes in these campaigns earned him respect as an able field commander, despite his youth.
During the Battle of Sekigahara, Yūki Hideyasu was ordered by Ieyasu to remain in his holdings in Shimōsa, possibly because of his pro-Toyotomi sympathies, and possibility because his emergence as a strong military leader might threaten the prestige and position of his younger half-brother, Tokugawa Hidetada. Following the Battle of Sekigahara and the establishment of the Tokugawa shogunate, he was given all of Echizen Province (670,000 koku) as his fief. In 1604, he was allowed to take the surname Matsudaira. In 1605, his court rank was elevated to Senior Third Rank, and his courtesy title to Gon-Chūnagon.
Hideyasu died, possibly from syphilis in 1607, at the age of 34, seven years after the Battle of Sekigahara, eight years before Tokugawa Ieyasu completed the destruction of the Toyotomi clan at the Siege of Osaka. He left a will to his heir urging support for Toyotomi Hideyori even if the Tokugawa decided to attack.
After marrying the daughter of Harutomo Yuki, with Hideyoshi’s permission, took the family name of Yuki (1590).