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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 spanned the years from 859 through 877. The two reigning emperors were Seiwa-tennō (清和天皇 ?) and Yōzei-tennō (陽成天皇 ?). [1]


Change of era

  • February 7, 859 Jōgan gannen (貞観元年 ?): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Ten'an 3, on the 25th day of the 4th month of 859.[2]

Events of the Jōgan era

  • 859 (Jōgan 1, 1st month): All New Year's festivities were suspended because of the period of national mourning for the death of Emperor Montoku.[3]
  • 864 (Jōgan 6, 5th month): Mount Fuji erupted during 10 days, and it ejected from its summit an immense quantity of cinders and ash which fell back to earth as far away as the ocean at Edo bay. May people perished and a great number of homes were destroyed. The volcanic eruption began on the side of Fuji-san closes to Mount Asama, throwing cinders and ash as far away as Kai province.[4]
  • 869 (Jōgan 10): Yōzei was born, and he is named Seiwa's heir in the following year.[5]
  • 876 (Jōgan 17, 11th month): In the 18th year of Seiwa-tennō 's reign (清和天皇18年), the emperor ceded his throne to his five-year-old son, which means that the young child received the succession (‘‘senso’’). Shortly thereafter, Emperor Yōzei formally acceded to the throne (‘‘sokui’’).[6]

See also


  1. ^ Titsingh, Isaac. (1834). Annales des empereurs du japon, p. 115-121; Brown, Delmer et al. (1979). Gukanshō, pp. 286-288; Varley, H. Paul. Jinnō Shōtōki, pp. 166-17.
  2. ^ Brown, p. 287.
  3. ^ Titsingh, p. 116.
  4. ^ Titsingh, p. 118.
  5. ^ Titsingh, p. 122.
  6. ^ Titsingh, p. 122; 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 Go-Murakami.]


External links

Jōgan 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th 16th 17th 18th 19th
Gregorian 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877

Preceded by:

Era or nengō:

Succeeded by:


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