Eiryaku (永暦) was a Japanese era name created under the traditional nengō system and lasting from January 1160 through September 1161. It followed the Heiji era and preceded the Ōhō era. The reigning sovereign during Eiryaku was Emperor Nijō (Nijō-tennō), and the period sits in the late Heian era when court politics were increasingly influenced by warrior clans.
Name and meaning
The era name Eiryaku combines the kanji 永 (ei, "eternal" or "long") and 暦 (ryaku, "calendar" or "chronicle"). Like other nengō, this title was chosen for its auspicious nuance rather than to record a ruler’s personal name. Era names were reset for various reasons such as auspicious omens, disasters, or political transitions.
Historical context
Eiryaku immediately followed a turbulent moment in Japanese history. The Heiji Rebellion (1159–1160) had brought decisive changes to the balance of power at court, accelerating the ascendancy of the Taira clan under leaders such as Taira no Kiyomori. The short span of Eiryaku is often viewed in light of this realignment: the imperial court remained nominally sovereign while samurai clans consolidated practical control over provincial and court affairs.
Notable features and legacy
- Dates: January 1160 to September 1161, a brief era of roughly one year and eight months.
- Preceded by Heiji and succeeded by Ōhō.
- Reign: Emperor Nijō was the reigning monarch during this time.
- Significance: marks the immediate aftermath of mid-12th-century power struggles and the continuing rise of samurai influence in the late Heian polity.
Because Eiryaku was brief and falls within a period of rapid political change, it is often cited in historical narratives as part of the transition from court-dominated rule toward the military governments that followed in later centuries. For further reading on era names and the late Heian political landscape, consult general works on Japanese medieval history and primary chronologies of imperial reigns.