Shimazu Yoshihisa

Shimazu Yoshihisa (1533–1611) was a Sengoku daimyo of Satsuma Province (present-day Kagoshima Prefecture) and the 16th head of the Shimazu clan. Together with his three accomplished younger brothers—Yoshihiro, Toshihisa, and Iehisa—he earned his place in history as one of the "Shimazu Four Brothers," realizing the clan's greatest territorial extent in the late 16th century. He commanded forces that dominated nearly all of Kyushu, yet was forced to submit following Toyotomi Hideyoshi's invasion of Kyushu. He is regarded as one of the greatest generals of the Sengoku period, known for his outstanding diplomatic and administrative abilities.

Yoshihisa was born in Tenbun 2 (1533) as the eldest son of Shimazu Takahisa. From youth, he was expected to succeed his father and formally inherited headship of the clan in Eiroku 9 (1566). He resolved the internal conflicts within the Shimazu clan that had persisted since Tenbun 19 (1550), and united with his three brothers—Yoshihiro, Toshihisa, and Iehisa—to pursue the unification of Kyushu.

In the Battle of Minakawa of Tenshō 6 (1578), he defeated the large army of Ōtomo Sōrin and secured control of Hyūga. In the Battle of Okitanawate of Tenshō 12 (1584), he defeated and killed Ryūzōji Takanobu, bringing Hizen under his control. Advancing from south to north across Kyushu, by Tenshō 14 (1586) his forces had grown so powerful that he invaded Bungo, the heartland of the Ōtomo clan.

However, in Tenshō 15 (1587), when Toyotomi Hideyoshi launched a massive invasion of Kyushu with over 200,000 troops, Yoshihisa decided to surrender. He secured the three provinces of Satsuma, Ōsumi, and Hyūga, successfully ensuring the survival of the Shimazu clan. At the Battle of Sekigahara in 1600, his younger brother Yoshihiro participated as a commander of the Western forces and earned renown through the "Shimazu Withdrawal." Yoshihisa himself rallied the clan and negotiated with Tokugawa Ieyasu, once again securing the Shimazu clan's survival. He passed away at age 79 in Keichō 16 (1611).

In his relationship with the Japanese sword, Yoshihisa left his mark in sword history as a daimyo who patronized swordsmiths of the Satsuma tradition. Satsuma was a land that cultivated its own distinctive blade culture, with schools like the Namikaze style (note: the five great traditions of Japanese swordsmithing are Yamato, Yamashiro, Bizen, Aoe, and Mino, and the Satsuma tradition is not among them), and during Yoshihisa's era, Satsuma swordsmiths produced excellent blades under their lord's patronage. Yoshihisa himself was also a lover of fine swords, and it is said he presented Satsuma tradition blades as gifts during his negotiations with Hideyoshi. The swords passed down through the Shimazu family are highly regarded today as the finest examples of the Satsuma tradition.