Yuki Hideyasu (March 1, 1574 – June 2, 1607) was a Japanese samurai who lived during the Azuchi–Momoyama and early Edo periods, serving as the daimyō of Fukui Domain in Echizen Province. Born Tokugawa Ogimaru, he was the second son of Tokugawa Ieyasu and Lady Oman (also known as Lady Kogō), a handmaiden to Ieyasu’s wife, Lady Tsukiyama. Due to Ieyasu’s fears of his wife’s reaction to Oman’s pregnancy, Ogimaru and his twin brother were born in secrecy at the home of Honda Shigetsugu, one of Ieyasu’s retainers. Oman’s other son eventually became a priest, while Ogimaru was raised apart from Ieyasu, whom he only met at the age of three, in a meeting arranged by his older half-brother, Matsudaira Nobuyasu.
After Nobuyasu’s forced seppuku at Oda Nobunaga’s command, Ogimaru became next in line to inherit the Tokugawa clan. However, as part of peace negotiations following the Battle of Komaki-Nagakute in 1584, he was given in adoption (effectively as a hostage) to Hashiba Hideyoshi. While under Hideyoshi’s care, Ogimaru came of age and was renamed Hashiba Hideyasu, a name that honored both his adoptive and biological fathers. He also received the title of Mikawa-no-kami and the Court rank of Senior Fifth Rank, Lower Grade, which was later elevated.
Hideyasu’s military career began with distinction, as he led the assault on Buzen-Iwaishi Castle during the Kyushu Campaign of 1587 and contributed to the pacification of Hyuga Province. He also participated in the Siege of Odawara in 1590 and the Japanese invasions of Korea (1592–1598), earning a reputation as a skilled and promising commander. However, in 1589, the birth of Toyotomi Hideyoshi’s natural son, Toyotomi Hideyori, altered Hideyasu’s trajectory. To avoid succession conflicts, Hideyasu was adopted by Yuki Harutomo of Shimōsa Province in 1590, marrying Harutomo’s niece and becoming the head of the Yuki clan, with a domain of 101,000 koku.
Despite his military achievements, Hideyasu’s loyalty to the Toyotomi clan raised concerns. During the Battle of Sekigahara in 1600, Tokugawa Ieyasu ordered Hideyasu to remain in Shimōsa, possibly due to doubts about his allegiance or to avoid overshadowing Ieyasu’s chosen successor, Tokugawa Hidetada. Following the Tokugawa victory, Hideyasu was rewarded with Echizen Province, a vast domain of 670,000 koku. In 1604, he was permitted to adopt the Matsudaira surname, and by 1605, his court rank was elevated to Senior Third Rank, along with the courtesy title Gon-Chunagon.
Hideyasu passed away in 1607 at the age of 34, possibly due to complications from syphilis. His death occurred shortly before the Siege of Osaka, where the Toyotomi clan was ultimately destroyed. In his will, Hideyasu urged his son and heir, Matsudaira Tadanao, to support Toyotomi Hideyori if the Tokugawa attacked. However, Tadanao ignored his father’s wishes, ensuring the survival of the Echizen-Matsudaira clan, which endured until the Meiji Restoration in 1868.
See also
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Minamoto no Yoshitsune
Minamoto no Yoshitsune was the son of Minamoto no Yoshitomo and his second wife, Tokiwa Gozen, as well as the younger half-brother of Minamoto no Yoritomo, the founder of the first shogunate, who had once suffered defeat in the struggle against the Taira clan. Yoshitsune spent his childhood in exile at the Kuramayama Temple. According to legend, he studied not so much Buddhist sutras there as the arts of war. At the age of fifteen, he entered the service of the governor in Mutsu, Fujiwara Hidehira.
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Miyoshi Chokei
The eldest son of Miyoshi Nagamoto (Motonaga), at the age of seventeen and with the support of Miyoshi Masanaga and Matsunaga Hisahide, invaded Kinai, the inner provinces of Japan, and in 1539 seized control of Kyoto. In 1543 he expelled Hosokawa Ujitsuna from the commercial city of Sakai and appointed his own brother, Sōgo Kazunari, as the city’s new leader. In 1548 he took the name Chōkei. When a conflict arose between him and Masanaga, Chōkei appealed to his liege lord, Hosokawa Harumoto, asking him to raise troops in the provinces of Settsu, Izumi, and Kawachi, but Harumoto instead chose to ally with Masanaga against Chōkei.
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Matsudaira Ietada
Matsudaira Ietada, also known as Tomomo-no Suke, was the eldest son of Matsudaira Koretada, the head of the Fukozu branch of the Matsudaira clan. Ietada was born in 1555 at Fukozu Castle. When he reached adulthood (for samurai children this age range was between 11 and 17), the Fukozu-Matsudaira clan was under the authority of Tokugawa Ieyasu and commanded by Sakai Tadatsugu. In the Battle of Nagashino in 1575, Tadatsugu’s unit, which included both Ietada and his father, took part in the assault on the fort on Mount Tobigasu-yama. During the fighting, Koretada was killed, and twenty-year-old Ietada became the new head of the clan.
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Matsudaira Tadaakira
Tadaakira was the fourth son of Okudaira Nobumasa, a vassal of the Tokugawa clan, and his mother was Kame, the eldest daughter of Tokugawa Ieyasu. In 1588, Tadaakira was adopted by Ieyasu and received the Matsudaira family name; at that time, he bore the name Kiyotada.
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Mashita Nagamori
Nagamori possessed remarkable diplomatic and administrative talent while remaining a brave warrior. He is believed to have come from the village of Mashita in the province of Owari, which today is part of Aichi Prefecture. He was a vassal of Oda Nobunaga and later served Toyotomi Hideyoshi. In the Battle of Komaki–Nagakute in 1584, Nagamori took at least two enemy heads. Later, he was entrusted with overseeing major public construction projects, including the reconstruction of Fushimi Castle and the building of the large Sanjō and Gojō bridges in Kyoto.
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Magara Jurōzaemon Naotaka
Magara Jurōzaemon Naotaka was a vassal of Asakura Yoshikage from the province of Echizen, and very little is known about his life, including even the exact year of his birth. Magara gained his renown through his heroic death at the Battle of Anegawa in 1570. In this battle, the combined forces of Oda Nobunaga and Tokugawa Ieyasu confronted the armies of Asai and Asakura, with Ieyasu taking command of the left flank and fighting against the Asakura forces. After crossing the shallow Anegawa River, which separated the two armies, Tokugawa’s finest generals — Honda Tadakatsu and Sakakibara Yasumasa — launched an assault on the headquarters of Asakura Kagetake, the commander-in-chief of the Echizen army. The attack by Honda Tadakatsu was so swift that Kagetake found himself almost completely surrounded by enemy troops.
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Kusunoki Masashige
Kusunoki Masashige was, without exaggeration, a genius of guerrilla warfare. If not for this talented commander, Emperor Go-Daigo would likely have failed not only to ascend the throne, but even to put up any real resistance against the powerful Hojo clan.
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Kobayakawa Takakage
Kobayakawa Takakage was rightfully considered one of the most intelligent men of his era. Even Kuroda Kanbei, the celebrated strategist famed for his cunning—about whom people said he could outwit even a fox—admitted that Takakage was his equal in intellect, and at times even surpassed him. After the death of his father, Mōri Motonari, Takakage effectively governed the Mōri clan for many years while serving as advisor to his nephew, Mōri Terumoto.
