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 eraEdit
- 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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