In 1581,
Oda Nobunaga invaded and conquered Iga. Construction on Iga Ueno Castle began in 1585 by the command of
Takigawa Katsutoshi. Under
Toyotomi Hideyoshi,
Tsutsui Sadatsugu (1562-1615), was transferred from
Kōriyama Castle in
Yamato Province to rule over Iga. He reconstructed the castle by dividing the hill into an upper eastern half and lower western half, with the upper portion forming the
honmaru, or
innermost bailey, with a three-story
tenshu on its eastern edge. Following the
Battle of Sekigahara,
Tokugawa Ieyasu expelled Tsutsui Sadatsugu from Iga Province for his pro-
Toyotomi stance and installed his trusted general
Tōdō Takatora to rule over Iga and the northern half of
Ise Province. Tōdō also had a reputation for castle architecture and had previously built
Uwajima Castle and
Imabari Castle. At Iga Ueno, he renovated the
honmaru, giving it high walls. This meant that the walls of the
honmaru of Iga Ueno Castle were the tallest of any castle in Japan. He also significantly expanded the castle area overall, with large
kuruwa terraces of over 100 meters in length extending to the east and west. This gave the castle an overall size of 800 meters by 400 meters in total, with the new inner baily shifted to the western half of the hill. The site of the Tsutsui
tenshu became the main residence, and a new five-story
tenshu was in the process of being constructed when it was destroyed in a wind storm in 1612. However, after the Toyotomi clan was extinguished at the
Siege of Osaka in 1615, the castle lost its importance and the
tenshu (along with a planned series of water moats and stone walls) was never completed. == Present situation ==