Ten'en

Ten'en was a Japanese era name used from 973 to 976 during the reign of Emperor En'yū.

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Japanese era name: A Japanese calendrical designation marking a period of an emperor's reign or a declared change of era. Ten'en is one entry in Japan's continuing sequence of named eras.
Heian period: A period of Japanese history from 794 to 1185, named for the imperial capital at Heian-kyō. Ten'en falls within the Heian period's court-centered political order.
Jōhō 5: The final year of the Jōhō era, corresponding mainly to 968. It immediately precedes Ten'en in the era chronology.
Gregorian calendar: The solar calendar introduced in 1582 and now used as the international civil calendar. Gregorian years provide the modern dates commonly paired with Ten'en years.
Emperor En'yū: The 64th emperor of Japan, whose reign lasted from 969 to 984. Ten'en was proclaimed and used during his reign.
Japanese imperial era system: The system of naming Japanese eras, traditionally changed by imperial proclamation. It explains how Ten'en functioned as a calendrical designation.
Ten'en 1: The first year of the Ten'en era, corresponding to 973. It marks the era's initial year under Emperor En'yū.
Chinese era name: A reign-based calendrical designation used in Chinese history, influencing neighboring East Asian naming traditions. Chinese era names offer a related but distinct historical dating tradition.
Japanese calendar: A calendrical system combining era names with traditional lunisolar dates and, later, the Gregorian calendar. Ten'en dates belong to Japan's era-based calendrical tradition.
Heian-kyō: The capital of Japan during the Heian period, located at present-day Kyoto. The court that used the Ten'en era name was based in Heian-kyō.