Kōji (Muromachi period)
Kōji was a Japanese era name after Tenbun and before Eiroku. This period spanned the years from October 1555 through February 1558. Reigning emperors were Emperor Go-Nara of Japan and Emperor Ogimachi of Japan.Change of era
- 1555 Kōji gannen: The era name was changed to mark an event or a number of events. The old era ended and a new once commenced in Tenbun 24.
The name originates from the following Chinese passage: 「祇承宝命、志弘治体」.Events of the ''Kōji'' era
- 1555 : A border war began between Mōri Motonari, daimyō of Aki Province, and Sue Harukata, daimyō of Suō Province.
- 1555 : The Mōri forces surrounded the Sue defenders in the Battle of Itsukushima. When the outcome of the battle became clear, Sue Harutaka committed suicide; and others, including Odomo-no Yoshinaga, followed Harutaka in suicide. This victory, and the subsequent consolidation of the Mōri holdings were owing to Motonari's four sons: Mōri Takamoto, Kikkawa Motoharu, Hoda Motokiyo, and Kobayakawa Takakage.
- 1555 : The forces of Takeda Shingen and Uesugi Kenshin met at the confluence of the Saigawa and the Chikumagawa in Shinano Province; and the fighting was known as the Battles of Kawanakajima.
- 1556 : The Ōmori silver mine fell into the control of the Mōri clan during a campaign in Iwami Province.
- September 27, 1557 : Emperor Go-Nara died at age 62.
