Tsutsui Sadatsugu

In this Japanese name, the surname is Tsutsui.

Tsutsui Sadatsugu
筒井 順慶
A portrait of Tsutsui Sadatsugu
Head of Tsutsui clan
In office 1584–1615
Preceded by	Tsutsui Junkei
Succeeded by	Tsutsui Juntei
Personal details
Born	June 6, 1562
Died	April 2, 1615(1615-04-02) (aged 52)
Parent	Tsutsui Junkei (father)
Military service
Allegiance	Toyotomi clan Eastern Army Tokugawa shogunate
Commands	Iga Ueno Castle
Battles/wars	Invasion of Shikoku (1585) Battle of Sekigahara (1600) Siege of Osaka (1615)

Tsutsui Sadatsugu (筒井 定次, June 6, 1562 – April 2, 1615) was a cousin and adopted son of Tsutsui Junkei, a feudal lord of the Yamato province. At the death of Junkei in 1584, he was relocated by Toyotomi Hideyoshi to Iga Province, where he built the Iga Ueno Castle.

In 1585, he participated at Hideyoshi Invasion of Shikoku against Chōsokabe clan.

In 1600, he took sides with the Tokugawa Ieyasu Eastern army in the Battle of Sekigahara.

In 1608, however, he was removed from his position by the Tokugawa shogunate, in an accusation of sloppy governance. In addition, the Tsutsui clan was forcefully abolished. The castle of Iga Ueno was accordingly taken over by Tōdō Takatora.

In 1615, Sadatsugu was ordered by the Shogunate to commit suicide on charge of his secret communication with the people of Osaka Castle during Winter Siege of Osaka. However, his son, Tsutsui Juntei was killed in action during Summer Siege of Osaka. Later, the Tsutsui clan disappeared.