Overview

Eikyū (永久) is the Japanese era name (nengō) that spanned from July 1113 through April 1118. It followed the Ten'ei era and preceded the Gen'ei era. The sovereign listed for this period is Emperor Toba, and the era is situated within the broader cultural and political framework of the Heian period.

Function and adoption of era names

The nengō system provides official chronological labels used in court records, temple inscriptions and chronicles. Era names in classical Japan were changed for various reasons, including auspicious events, imperial succession, natural disasters or other circumstances perceived as signalling a need for renewal. Eikyū is one of many short eras that helped organize the court calendar and administrative acts.

Historical context

The Eikyū years fall within the Heian period, a time noted for its court-centered culture, refined literary production and the influence of powerful aristocratic families. Political authority operated through formal offices at court while retired emperors, regents and leading clans continued to shape policy and succession. The Eikyū era therefore forms part of ongoing patterns of ceremonial government, patronage of temples and monasteries, and artistic activity.

Uses for historians and archivists

References to Eikyū appear in chronicles, temple records and dated inscriptions. Converting such dates to the modern Gregorian calendar requires matching the named era to its precise starting month and year—July 1113 in this case—and accounting for the old lunisolar calendar conventions. Because era names are chronological and cultural signifiers, they are useful for situating religious, administrative and artistic events within a recognizable span.

Notable features

  • Placement: Eikyū is one of many era names used within the reign of an emperor to mark distinct chronological intervals.
  • Chronology: conventionally given as July 1113–April 1118, bridging the Ten'ei and Gen'ei eras.
  • Research value: era names like Eikyū aid the organization of primary sources but must be cross-checked when converting to modern calendar dates.