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Ōan (応安), also romanized as Ō-an, was a Japanese era name (年号, nengō, lit. year name) of the Northern Court during the Nanboku-chō period after Jōji and before Eiwa. This period started in February 1368 and ended in February 1375. The pretenders in Kyoto were Emperor Go-Kōgon (後光厳天皇 Go-Kōgon-tennō ) and Emperor Go-En'yū (後円融天皇 Go-En'yū-tennō ) The Southern Court rivals in Yoshino during this time were Emperor Go-Murakami (後村上天皇 Go-Murakami-tennō ) and Emperor Chōkei (長慶天皇 Chōkei-tennō ).
Events of the Ōan era
- 29 March 1368 (Ōan 1, 21st day of the 2nd month): Emperor Go-Murakami died; and his oldest son received the succession.
- 1370 (Ōan 3): Imagawa Sadayo sent to subdue Kyūshū.
- 1373-1406 (Ōan 6 – Ōei 13): Embassies between China and Japan.
- 1374 (Ōan 7): En'yū became the head of the Northern Court.
Southern Court nengō
- Nussbaum, Louis-Frédéric. (2005). "Ō-an" in Japan encyclopedia, p. 731.
- Nussbaum, "Go-Kōgon Tennō," p. 255.
- Nussbaum, "Go-En'yū Tennō," p. 251; Titsingh, Isaac. (1834). Annales des empereurs du japon, pp. 310-312.
- Nussbaum, "Chōkei Tennō," p. 120.
- Ponsonby-Fane, Richard. (1959). The Imperial House of Japan, p. 138; Kunaichō, 後村上天皇 (97); retrieved 2012-10-2.
- Titsingh, p. 310; Varley, p. 44; a distinct act of senso is unrecognized prior to Emperor Tenji; and all sovereigns except Jitō, Yōzei, Go-Toba, and Fushimi have senso and sokui in the same year until the reign of Emperor Go-Murakami. Compare Kunaichō, Ceremony of Accession (Sokui-no-Rei); retrieved 2012-6-29.
- Ackroyd, Joyce. (1982) Lessons from History: The "Tokushi Yoron", p. 329.
- National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection
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