Tengyō

Tengyō was a Japanese era name used from 938 to 947, during the reign of Emperor Suzaku.

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Japanese era name: A reign- or period-based name used to identify years in the Japanese calendar. Tengyō is one entry in Japan’s sequence of era names.
Japanese era conversion: The process of translating a Japanese era year into a Gregorian calendar year. It converts a Tengyō year into its corresponding modern date.
Tengyō Incident: A failed rebellion led by Taira no Masakado in eastern Japan in 939. The rebellion unfolded during Tengyō and gave the era one of its defining crises.
Taira no Masakado's Rebellion: A rebellion in eastern Japan from 939 to 940 led by Taira no Masakado. Its dates place a major challenge to court authority inside Tengyō.
Emperor Suzaku: The sixty-first emperor of Japan, whose reign lasted from 930 to 946. Tengyō began and continued during Suzaku’s reign.
Japanese lunisolar calendar: The historical Japanese calendar, based on lunar months adjusted to the solar year. Tengyō dates originally followed lunisolar months, not Gregorian months.
Taira no Masakado: A provincial Japanese warrior who led a major rebellion against the imperial court in 939. His uprising became the most prominent political crisis of Tengyō.
Tengyō no Ran: The paired rebellions of Taira no Masakado and Fujiwara no Sumitomo in the tenth century. The term groups crises that occurred during Tengyō and its surrounding years.
Heian period: A period of Japanese history traditionally dated from 794 to 1185. Tengyō falls within the Heian period.
Nengō: The system of Japanese era names used to designate calendar periods. Tengyō follows the nengō convention of naming periods rather than numbering years continuously.