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Kōryaku (康暦) was a Japanese era name (年号, nengō, lit. year name) of the Northern Court during the Era of Northern and Southern Courts after Eiwa and before Eitoku. This period spanned the years from March 1379 through February 1381.^[1] The emperor in Kyoto was Emperor Go-En'yū (後円融天皇, Go-En'yū-tennō)^[2] The Southern Court rival in Yoshino during this time-frame was Emperor Chōkei (長慶天皇, Chōkei-tennō).

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

Until the end of the Edo period, the militarily superior pretender-Emperors supported by the Ashikaga shogunate had been mistakenly incorporated in Imperial chronologies despite the undisputed fact that the Imperial Regalia were not in their possession.^[3]

This illegitimate Northern Court (北朝, hokuchō) had been established in Kyoto by Ashikaga Takauji.^[3]

• 1379, also called Kōryaku gannen (康暦元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Eiwa 5.

In this time frame, Tenju (1375–1381) was the Southern Court equivalent nengō.^[4]

• 1379 (Kōryaku 2): Shiba Yoshimasa becomes Kanrei.^[5]
• 1380 (Kōryaku 3): Kusunoki Masanori rejoins Kameyama; southern army suffers reverses.^[5]
• July 26, 1380 (Kōryaku 2, 24th day of the 6th month): The former Emperor Kōmyō died at age 60.^[6]

• Ackroyd, Joyce. (1982) Lessons from History: The Tokushi 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