
Masakatsu was a member of the Uemura clan and the son of Uemura Masatada; from an early age he served Tokugawa Ieyasu. During the Ikkō-ikki uprising in Mikawa Province in 1563, having converted from the Jōdo Shinshū Buddhist sect to the Jōdoshū sect, he took part in suppressing the rebels. After these events, Masakatsu was appointed a military governor and was granted land holdings. According to a number of sources, he was one of the so-called “Three Governors of Mikawa” (Mikawa sanbugyō), together with Amano Yasukage (1537–1613) and Koriki Kiyonaga (1530–1608).
At various times in his career, Masakatsu served as the castellan of Horie and Hamana Castles and took part in the Battle of Anegawa in 1570. During the Battle of Mikatagahara in 1573, he covered Tokugawa Ieyasu’s retreat to Hamamatsu Castle and, together with Amano Yasukage, defended the castle gates.
Masakatsu also participated in the Battle of Nagashino in 1575, the siege of Takatenjin Castle, and the Komaki–Nagakute Campaign in 1584. After Ieyasu moved his headquarters to Sunpu Castle, Masakatsu was appointed castellan of Hamamatsu Castle.
During the Odawara Campaign in 1590, Masakatsu refused to carry out an order from Toyotomi Hideyoshi, as a result of which he was removed from command and stripped of his land holdings. He then retired to the estate of his son Masayoshi in Sagami Province, where he spent the remainder of his life. Masakatsu was buried at Sairen-ji Temple in the city of Yokohama.
See also
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
