Yoshiaki, a loyal vassal of the Oda clan, first distinguished himself as a talented warrior during the Battle of Shizugatake in 1583. For his bravery and outstanding military achievements, he was included in the famous group known as the “Seven Spears of Shizugatake” — an elite band of samurai celebrated for their exceptional courage in that battle. Later, Yoshiaki became one of Toyotomi Hideyoshi’s naval admirals and took an active part in his subsequent military campaigns. He commanded warships during the expeditions to Kyushu and the siege of Odawara, demonstrating not only valor but also exceptional leadership and strategic skill. For his loyal service and effective command, Yoshiaki was granted an estate in Matsuzaki with an annual income of 100,000 koku of rice — a symbol of significant rank and prosperity.
During the first and second Korean campaigns, Yoshiaki continued to serve under Hideyoshi’s banner, participating in several naval battles along the southern coast of the Korean Peninsula. His fleet played a vital role in securing Japanese dominance at sea, and Yoshiaki earned a reputation as an experienced naval commander capable of leading effectively under the harsh conditions of long-distance warfare.
After the death of Toyotomi Hideyoshi, Kato Yoshiaki entered the service of Tokugawa Ieyasu, proving himself a wise and farsighted statesman who understood where the future of Japan lay. In 1600, he fought on the side of Tokugawa during the decisive Sekigahara campaign, which shaped the destiny of Japan for generations to come. During the Battle of Sekigahara, Yoshiaki commanded a 3,000-man unit in the vanguard of the Eastern Army and engaged fiercely with the forces led by Shima Sakon. His troops showed remarkable endurance and discipline, contributing significantly to the ultimate victory of the Tokugawa forces.
For his loyalty and valor, Tokugawa Ieyasu generously rewarded Yoshiaki by granting him vast lands in Iyo Province on the island of Shikoku (modern-day Ehime Prefecture), with his annual income increased to 200,000 koku of rice. This reward reflected Tokugawa’s deep trust and recognition of Kato Yoshiaki as one of the most distinguished military commanders of his era.
As a symbol of his power and the dawn of a new age, Kato Yoshiaki ordered the construction of the magnificent Matsuyama Castle on his new lands, which would become the main seat of his clan. Construction began in 1602 and lasted for twenty-five years, making it one of the grandest architectural projects of its time. Approximately 150,000 stone blocks were used to build its massive walls and towers. Over time, Matsuyama Castle became not only the administrative center of Yoshiaki’s domain but also one of the finest examples of Japanese defensive architecture from the early Edo period — a lasting symbol of strength, wisdom, and devotion to the samurai spirit.
See also
-
Takeda Nobuyoshi
Takeda Nobuyoshi (1128–1186 or later) was a prominent Japanese samurai lord of the late Heian and early Kamakura periods and the founder of the Takeda clan.
-
Tokugawa Iemochi
Tokugawa Iemochi (1846–1866) was the fourteenth shōgun of the Tokugawa shogunate and ruled from 1858 until his death. His reign came during the turbulent final years of the shogunate, when Japan faced growing Western pressure and serious internal political conflict.
-
Tokugawa Ienari
Tokugawa Ienari (1773–1841) was the eleventh shōgun of the Tokugawa shogunate and ruled from 1787 to 1837, making him the longest-serving Tokugawa shōgun. He was a great-grandson of the eighth shōgun, Tokugawa Yoshimune.
-
Matsudaira Nobuyasu
Matsudaira Nobuyasu was only twenty years old when his father ordered him to commit seppuku. The reason was not a defeat in battle, but a crisis inside the Tokugawa family that had become too dangerous to ignore.
-
Yamagata Masakage
Masakage was one of Takeda Shingen’s most loyal and capable commanders. He was included in the famous list of the “Twenty-Four Generals of Takeda Shingen” and also belonged to the inner circle of four especially trusted warlords known as the Shitennō.
-
Yagyu Munenori
Yagyū Munenori began his service under Tokugawa Ieyasu while his father, Yagyū Muneyoshi, was still at his side. In 1600, Munenori took part in the decisive Battle of Sekigahara. As early as 1601, he was appointed a kenjutsu instructor to Tokugawa Hidetada, Ieyasu’s son, who later became the second shogun of the Tokugawa clan.
-
Yagyu Muneyoshi
A samurai from Yamato Province, he was born into a family that had been defeated in its struggle against the Tsutsui clan. Muneyoshi first took part in battle at the age of sixteen. Due to circumstances beyond his control, he was forced to enter the service of the Tsutsui house and later served Miyoshi Tōkei. He subsequently came under the command of Matsunaga Hisahide and in time became a vassal first of Oda and later of Toyotomi.
-
Endo Naozune
Naozune served under Azai Nagamasa and was one of the clan’s leading vassals, renowned for his bravery and determination. He accompanied Nagamasa during his first meeting with Oda Nobunaga and at that time asked for permission to kill Nobunaga, fearing him as an extremely dangerous man; however, Nagamasa did not grant this request.
