His childhood name was Gengorō (源五郎) and he was the 11th son of
Oda Nobuhide. In 1574, he received the
Chita District in
Owari and the construction of
Ōkusa Castle. Later, he was commissioned to serve
Oda Nobutada in the
Siege of Iwamura (1575),
Siege of Shigisan (1577),
Siege of Itami (1579),
Siege of Takato (1582) and
Battle of Tenmokuzan (1582). Nagamasu was an accomplished practitioner of the
Japanese tea ceremony, which he studied under the master,
Sen no Rikyū. He eventually started his own school of the tea ceremony. In June 1582, during
the incident at Honnō-ji, he was one of the vassals of Nobutada in
Nijō Castle, he was able to survive and fled to
Gifu Castle. In 1584, he then joined
Oda Nobukatsu and collaborated with
Tokugawa Ieyasu against Hideyoshi at the
Komaki - Nagakute campaign and battled against
Takigawa Kazumasu at the
Siege of Kanie Castle. Later, he was one of the peacemakers between
Tokugawa Ieyasu and
Toyotomi Hideyoshi, also between
Sassa Narimasa and
Maeda Toshiie. In 1600, he sided with
Tokugawa Ieyasu and fought at the
Battle of Sekigahara. He brought 450 soldiers to join Ieyasu eastern side and confronted
Gamō Yorisato (Satoie) from western side. He was awarded 30,000 koku in
Yamato Province after the war. In 1615, Nagamasu divided his fief between his sons
Oda Nagamasa and
Oda Hisanaga. Nagamasa founded the Kaijū-Shibamura Domain, while Hisanaga became lord of the
Yanagimoto Domain. He died in Kyoto on December 13 of 1621. Aged 74. ==Family==