Hojo Ujiyasu (1515 – October 21, 1571), the third head of the Odawara Hojo clan, was a formidable daimyo known as the "Lion of Sagami." Revered as a fearsome samurai and brilliant strategist, he became famous for successfully breaking sieges by renowned warlords Takeda Shingen and Uesugi Kenshin. Ujiyasu was the son of Hojo Ujitsuna, and his only known wife was Zuikei-in, sister of Imagawa Yoshimoto. Among his children were Hojo Ujimasa and Uesugi Kagetora.
Born in 1515, Ujiyasu, originally named Chiyomaru, fought his first battle at the age of 15 against Uesugi Tomooki of the Ogigayatsu Uesugi clan at the Battle of Ozawahara in 1530. When his father died in 1541, many of the Hojo’s enemies saw an opportunity to strike. However, Ujiyasu rose to the challenge, reorganizing the Hojo lands and implementing key reforms, including cadastral surveys (1542-1543) and a taxation overhaul in 1550.
Odawara, where his family’s stronghold Odawara Castle was located, became a thriving trade center under his leadership. Ujiyasu developed the area by reorganizing roads and establishing artisans' guilds, markets, and post stations throughout the Hojo-controlled territory, solidifying his power in the Kanto region.
In 1545, Uesugi Tomosada, son of Uesugi Tomooki, sought to retake Kawagoe Castle with a large coalition of forces. Despite being vastly outnumbered, Ujiyasu, using strategic intelligence and ninja to gather information, led a decisive night raid during the Siege of Kawagoe Castle, securing a major victory. This triumph marked a turning point in the Kanto region, leading to the downfall of the Ogigayatsu Uesugi clan and diminishing the prestige of Uesugi Norimasa, Kanto kanrei (Governor-General of the Kanto).
Ujiyasu’s conquests continued. In 1551, he defeated Uesugi Norimasa at Hirai Castle, forcing him to flee to Echigo, where he was sheltered by his retainer Nagao Kagetora (later Uesugi Kenshin). Ujiyasu’s strategic brilliance expanded the Hojo clan’s territory across Sagami, Izu, Musashi, Shimosa, and Kazusa provinces.
By 1559, Ujiyasu retired, passing formal leadership to his son Hojo Ujimasa. However, even in retirement, Ujiyasu played a key role in defending the Hojo clan’s interests, including fending off multiple sieges led by Uesugi Kenshin and Takeda Shingen, two of the period’s most powerful warlords.
The Hojo’s territory continued to expand under Ujiyasu, but their ambitions led to conflicts with neighboring clans. Notably, in 1567, the Hojo forces suffered a defeat against the Satake clan at the Battle of Numajiri, halting their eastern expansion.
Ujiyasu's diplomatic skills helped him make peace with his former adversaries, Uesugi Kenshin and Takeda Shingen. He solidified alliances through marriage—one of his daughters married Imagawa Ujizane, and another, Hojo Masako, became the second wife of Takeda Katsuyori. Ujiyasu passed away in 1571, leaving behind a powerful legacy and a stable domain for his son Ujimasa to inherit.
See also
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Oishi Yoshio
Oishi Yoshio (April 24, 1659 – March 20, 1703) served as the chamberlain of the Ako Domain in Harima Province, now part of modern-day Hyogo Prefecture, from 1679 to 1701. He is best known as the leader of the Forty-seven Rōnin in their 1703 vendetta and is honored as the central figure in the legendary tale of Chūshingura.
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Asano Nagaakira
Asano Nagaakira (March 18, 1586 – October 16, 1632) was a Japanese samurai and daimyō of the early Edo period. He initially ruled Wakayama Domain before being transferred to the Hiroshima Domain, where his family would remain until the Meiji Restoration.
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Takigawa Kazumasu
Takigawa Kazumasu (1525 – October 21, 1586), also known as Takikawa Sakon or Sakonshogen, was a prominent samurai and daimyō of the Sengoku period. He served as a loyal retainer and military commander under Oda Nobunaga and later Toyotomi Hideyoshi. His biological son, Toshimasu, was adopted by Maeda Toshihisa, the elder brother of Maeda Toshiie, and Kazumasu served alongside Toshiie in Nobunaga’s campaigns.
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Sanada Yukitaka
Sanada Yukitaka (c. 1512 – June 8, 1574) was a renowned samurai warrior of the Sengoku period, best known as one of the "Twenty-Four Generals of Takeda Shingen." He was the father of Sanada Nobutsuna and Sanada Masayuki, as well as the grandfather of the legendary Sanada Yukimura, who later served the Toyotomi clan.
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Torii Mototada
Torii Mototada (1539 – September 8, 1600) was a Japanese samurai and daimyo who lived through the Sengoku and late Azuchi–Momoyama periods. A loyal retainer of Tokugawa Ieyasu, he is best remembered for his heroic last stand at the Siege of Fushimi, an event that played a crucial role in shaping Japanese history.
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Toyotomi Hideyori
Toyotomi Hideyori (August 28, 1593 – June 4, 1615) was the son and designated successor of Toyotomi Hideyoshi, the general who first unified Japan. His mother, Yodo-dono, was Oda Nobunaga's niece.
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Okubo Tadanori
Okubo Tadanori (January 13, 1842 – August 10, 1897) was the 9th daimyo of Odawara Domain in Sagami Province (modern-day Kanagawa Prefecture) during the late Edo period. Before the Meiji Restoration, he held the courtesy title of Kaga no Kami.
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Okubo Tadayo
Okubo Tadayo (1532 – October 28, 1594) was a samurai general who served Tokugawa Ieyasu during the Azuchi–Momoyama period and later became the daimyo of Odawara Domain in the early Edo period.
