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Jōgan (貞観) was a Japanese era name (年号, nengō, , lit. "year name") after Ten'an and before Gangyō. This period started in April 859 and ended in April 877. During this time, the emperors were Seiwa-tennō (清和天皇) and Yōzei-tennō (陽成天皇).
Events of the Jōgan era
- 859 (Jōgan 1, 1st month): New Year's festivities were suspended during national mourning for the death of Emperor Montoku.
- 864 (Jōgan 6, 5th month): Mount Fuji erupted during 10 days. Cinders and ash fell to earth as far away as Kai Province.
- 869 (Jōgan 10): Prince Sadaakira was born. He will later become Emperor Yōzei.
- 9 July 869 (May 26, Jōgan 11). The 869 Sanriku earthquake and tsunami causes damage at the Sanriku coast near Sendai.
- 870 (Jōgan 11): Sadaakira was named Seiwa's heir.
- 876 (Jōgan 17, 11th month): In the 18th year of Seiwa's reign, the emperor abdicated. His five-year-old son received the succession (senso). Soon after, Emperor Yōzei accepted the monarch's role and duties and powers (sokui). This was confirmed in ceremonies.
A collection of laws issued after 811 was published during this era. It was called the Jōgan kyaku-siki.
- Nussbaum, Louis-Frédéric. (2005). "Jōgan" in Japan Encyclopedia, p. 429.
- Titsingh, Isaac. (1834). Annales des empereurs du japon, p. 115-121; Brown, Delmer et al. (1979). Gukanshō, p. 287; Varley, H. Paul. Jinnō Shōtōki, pp. 166-17.
- Titsingh, p. 116.
- Titsingh, p. 118.
- Titsingh, p. 122.
- Titsingh, p. 122; Brown, p. 287.
- Yozei was formally established as emperor on January 20, 877 (Gangyō 1, 3rd day of the 1st month).
- 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 Imperial Household Agency (Kunaichō), Ceremony of Accession (Sokui-no-Rei); retrieved 2012-1-6.
- Nussbaum, "Jōgan kyaku-siki" in Japan Encyclopedia, p. 429.
- National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection
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