
Niwa Nagahide, born in 1535 in Aichi, Owari Province (present-day Nishi-ku in Nagoya City), played a crucial role in the historical landscape of feudal Japan. Directly serving Oda Nobunaga, he earned a distinguished position as one of Nobunaga's most esteemed senior vassals.
Throughout his career, Nagahide actively participated in numerous significant battles, showcasing his unwavering loyalty. The Battle of Nagakute in 1584 stands as an exception, as illness prevented his direct involvement in the fighting during that campaign.
Nobunaga held Nagahide in high regard, exemplified by Nagahide's marriage to Nobunaga's adopted daughter. Additionally, his son, Nagashige, wed Nobunaga's fourth daughter. In recognition of his leadership prowess, Nagahide was granted Wakasa Province (currently southern Fukui Prefecture) and Sawayama Castle in Omi (Shiga Prefecture). Nobunaga entrusted him with the construction of Azuchi Castle, showcasing the deep trust between lord and vassal.
A significant honor came in 1581 when Niwa Nagahide was selected to lead a grand military parade orchestrated by Nobunaga. This spectacle served both as a demonstration of authority and as public entertainment for the Emperor, the Imperial Court, foreign missionaries, and the people of Kyoto.
Tragedy struck in 1582 when Nagahide accompanied Oda Nobutaka on a campaign to quell Shikoku, following Nobunaga's orders. However, the campaign was abruptly halted by the Honno-ji Incident, where Akechi Mitsuhide betrayed and felled Nobunaga. Promptly abandoning the campaign, Nagahide joined forces with Toyotomi Hideyoshi to avenge their fallen master. He continued to support Hideyoshi during the Kiyosu Kaigi, a pivotal meeting held at Kiyosu Castle to determine the future of the Oda clan.
Nagahide played a crucial role in the conflict against Shibata Katsuie at Shizugatake under Hideyoshi's leadership. In recognition of his contributions, he was awarded Echizen and Kaga Provinces (present-day Fukui and Ishikawa Prefectures), attaining daimyo status with an income of 1,230,000 koku.
Regrettably, Niwa Nagahide passed away on May 15, 1585. While some records attribute his death to illness, others suggest that he committed seppuku, driven by a sense of guilt for inadvertently playing a significant role in Hideyoshi's rise to power within the Oda clan.
See also
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Taira no Masakado

Taira no Masakado embodied the quintessential samurai of his era—self-assured, harsh, and unyielding. In his youth, he served in the palace guard and repeatedly proved his bravery while suppressing unrest. Thanks to these achievements, Masakado sought the post of chief of the capital’s military-police office (the kebiishi-chō), but he was rejected: by that time, nearly all court positions—now little more than privileged sinecures—were controlled by members of the powerful Fujiwara clan.
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Sakakibara Yasumasa

Yasumasa was the second son of Sakakibara Nagamasa and was born in Ueno in Mikawa Province. From a young age, he began serving Tokugawa Ieyasu and eventually rose to the position of one of his most trusted generals. His wife was the daughter of Osuga Yasutaka. Ieyasu first noticed the young Yasumasa during the suppression of the Ikkō-ikki uprising in Mikawa in 1564. Thanks to his demonstrated abilities, Yasumasa was granted the privilege of using the character “yasu”—the second character of Ieyasu’s own name—in his own. Although he was the second child in his family, he became his father’s heir, though the exact reasons for this remain unknown.
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Sakai Tadatsugu

Tadatsugu was one of the most renowned generals serving Tokugawa Ieyasu. After Ieyasu broke ties with the Imagawa clan, Tadatsugu—an ardent supporter of this decision—was granted command of Yoshida Castle in 1565, which controlled the coastal road from Tōtomi to Mikawa. During the Battle of Mikatagahara in 1573, he held the right flank of the Tokugawa forces even when the troops sent by Oda fled under the assault of the Takeda army. In the Battle of Nagashino in 1575, he personally requested permission to carry out a night attack on the Takeda camp, which he executed brilliantly together with Kanamori Nagachika.
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Ryuzoji Takanobu

Takanobu was the eldest son of Ryūzōji Takaie and the great-grandson of Ryūzōji Iekane. His father was killed by a man named Baba Yoritiku in 1544. At a young age, Takanobu took Buddhist vows and received the monastic name Engetsu. However, around the age of eighteen, he returned to secular life, and in 1548, after the death of Ryūzōji Tanehide, he became the head of both branches of the Ryūzōji family.
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Ouchi Yoshihiro

Ōuchi Yoshihiro was the second son of Ōuchi Hiroyo, who headed the Ōuchi clan in the western part of Honshu. In 1363, Shogun Ashikaga Yoshimitsu confirmed the Ōuchi family in the position of shugo of Suō and Nagato Provinces. In his youth, Yoshihiro assisted his father in strengthening the influence of the Northern Court on the island of Kyushu — they served under Imagawa Ryōsun, who had been tasked with subjugating the nine provinces of Kyushu.
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Ouchi Yoshioki

Ouchi Yoshioki, the ruler of the provinces of Suo, Nagato, and Iwami, was one of the most capable military commanders and politicians of the late 15th and early 16th centuries. The son of Ouchi Masahiro, he governed from his residence in Yamaguchi in the province of Suo. In 1499, Yoshioki gave refuge to Shogun Ashikaga Yoshitane, who had been driven out of Kyoto by Hosokawa Masamoto. Shogun Yoshizumi, Masamoto’s protégé, ordered the lords of Kyushu to unite their forces against Yoshioki; however, they did not dare to do so, fearing the power of a man who by that time controlled six provinces. Having gathered a substantial army, Yoshioki marched from his native Suo toward Kyoto in order to restore Shogun Yoshitane to power.
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Otomo Sorin

Ōtomo Yoshishige came from a noble lineage, being the eldest son of Ōtomo Yoshiaki, the ruler of Funai Province. The roots of the Ōtomo family traced back to Fujiwara Hidesato, the adopted son of Nakahara Chikayoshi. Fujiwara served Minamoto Yoritomo during the Genpei War and took part in battles in Mutsu Province in 1189. In 1193, he was appointed shugo of Buzen and Bungo Provinces, after which he adopted a new surname—Ōtomo.
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Okudaira Sadamasa

Sadamasa was the son of Okudaira Sadayoshi and took part in several battles under Tokugawa Ieyasu, distinguishing himself in the Battle of Anegawa in 1570, where he took two heads. Around 1572 he was forced to enter the service of the Takeda clan, but after the death of Takeda Shingen in 1573 he returned to Tokugawa, leaving Tsukude Castle together with his men. As a result of this defection, Takeda Katsuyori ordered the execution of Sadamasa’s wife and brother, who were being held as hostages.
