Knowra Jōgan Jōgan Jōgan was a Japanese era name used from 859 to 877, during the reign of Emperor Seiwa. It belongs to the historical system of Japanese nengō, or era names.
Emperor Seiwa : The 56th emperor of Japan, who reigned from 858 to 876. Jōgan began during Seiwa’s reign and continued through its final year.
Nengō : A Japanese system of era names used to identify years and historical periods. Jōgan is one named period within this system.
Jōgan Seismic Event : A major earthquake that struck the Sanriku coast of northeastern Japan in 869. It occurred during Jōgan and prompted court responses to disaster.
Jōgan 1 : The first year of the Jōgan era, corresponding to 859. This is the standard era-year designation for Jōgan’s opening year.
Ten'an : A Japanese era name used from 857 to 859, immediately before Jōgan. Ten'an preceded Jōgan, with 859 serving as the transition year.
Emperor Montoku : The 55th emperor of Japan, whose reign preceded Emperor Seiwa’s. Montoku’s reign ended in 858, shortly before Jōgan began.
Japanese calendar : A calendar system used in Japan, incorporating both traditional lunisolar dates and modern Gregorian dates. Dating events within Jōgan requires distinguishing era years from modern calendar years.
Jōgan Gannen : The first year of the Jōgan era, corresponding to 859. It marks the era’s beginning and the transition from the previous era.
Jōgan 10 : The tenth year of the Jōgan era, corresponding to 868. It illustrates how an era year is counted from Jōgan’s first year.
Gangyō : A Japanese era name used from 877 to 885, immediately after Jōgan. Gangyō replaced Jōgan in 877.
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