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Kōō (康応), also romanized asKō-ō, was aJapanese era name (年号,nengō, lit. year name) of theNorthern Court during theEra of Northern and Southern Courts afterKakei and beforeMeitoku. This period spanned the years from February 1389 to March 1390.^[1] The emperor in Kyoto wasEmperor Go-Komatsu (後小松天皇,Go-Komatsu-tennō)^[2] TheSouthern Court rival in Yoshino during this time-frame wasEmperor Go-Kameyama (後亀山天皇,Go-Kameyama-tennō).

This illegitimateNorthern Court (北朝,hokuchō) was established inKyoto byAshikaga Takauji in 1336.^[3] Until the end of theEdo period, the militarily superior pretender-Emperors supported by theAshikaga shogunate were incorporated in Imperial chronologies, even though theImperial Regalia were never in their possession.^[3]

During theMeiji period, an Imperial decree dated March 3, 1911 established that the legitimate reigning monarchs of this period were the direct descendants ofEmperor Go-Daigo throughEmperor Go-Murakami, whose Southern Court (南朝,nanchō) had been established in exile inYoshino, near Nara.^[3]

• 1389, also calledKōō gannen (康応元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced inKakei 3.

In this time frame,Genchū (1384–1393) was the Southern Court equivalentnengō.^[4]

• 1389 (Kōō 1): Dissension continues in Toki family inMino.^[5]
• 1389 (Kōō 1): Yoshimitsu pacifies Kyūshū and distributes lands; Yoshimitsu opposed by KamakurakanreiAshikaga Ujimitsu.^[5]
• 1389 (Kōō 1, 7th month): TheudaijinSaioinji Sanetoshi died at the age of 56.^[6]
• 1390 (Kōō 2): Kusunoki defeated; Yamana Ujikiyo chastises Tokinaga.^[5]

• Ackroyd, Joyce. (1982)Lessons from History: TheTokushi Yoron. Brisbane:University of Queensland Press.ISBN 978-0-7022-1485-1
• Mehl, Margaret. (1997).History and the State in Nineteenth-Century Japan. New York:St Martin's Press.ISBN 978-0-312-21160-8;OCLC 419870136
• Nussbaum, Louis Frédéric and Käthe Roth. (2005).Japan Encyclopedia. Cambridge:Harvard University Press.ISBN 978-0-674-01753-5;OCLC 48943301
• Thomas, Julia Adeney. (2001).Reconfiguring Modernity: Concepts of Nature in Japanese Political Ideology. Berkeley:University of California Press.ISBN 978-0-520-22854-2;OCLC 47916285
• Titsingh, Isaac. (1834).Nihon Odai Ichiran; ou,Annales des empereurs du Japon. Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland.OCLC 5850691

• National Diet Library, "The Japanese Calendar"-- historical overview plus illustrative images from library's collection

• 1380s in Japan
• 1389 in Asia
• 1390 in Asia
• 1390s in Japan
• Japanese eras
• 14th-century neologisms

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• Articles with short description
• Short description is different from Wikidata
• Articles containing Japanese-language text