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Kōji (Muromachi period)
Kōji ( was a 弘治) Japanese era name ( after 年号 , "year name") nengō and before Tenbun . This period spanned the years from October 1555 through February 1558. Eiroku Reigning emperors were  Go-Nara -tennō ( and 後奈良天皇) Ōgimachi -tennō (. 正親町天皇)
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 弘治元年) Tenbun 24.
The name originates from the following Chinese passage: 「祇承宝命、志弘治体」.
Events of the Kōji era
1555 ( Kōji 1, 1st month): A border war began between Mōri Motonari, of daimyō Aki Province, and Sue Harukata, daimyō of Suō Province. 
1555 ( Kōji 1, 11th month): 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 ( Kōji 1): 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 ( Kōji 2): The Ōmori silver mine fell into the control of the Mōri clan during a campaign in Iwami Province.  September 27, 1557 ( Kōji 3, 5th day of the 9th month): Emperor Go-Nara died at age 62. 
^ Nussbaum, Louis-Frédéric. (2005). "
Kōji" in n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, Japan encyclopedia, p. 545; see Deutsche Nationalbibliothek Authority File Archived 2012-05-24 at Archive.today.
^ Titsingh, Isaac. (1834).
Annales des empereurs du japon, pp. 372–382.
^ a b c Titsingh,
^ Sansom, George. (1961)
A History of Japan, 1334–1615, p. 246.
^ Sansom, p. 257.