Daiji (era) — Japanese era name, 1126–1131

Origins and naming

Japan’s era-name system, or nengō, was used to mark and reset regnal years for administrative, calendrical, and symbolic reasons. Court officials selected new era names to mark significant events, natural phenomena, or to express hopes for renewal. Daiji replaced the preceding era in early 1126 as part of that ongoing practice.

Historical context

Daiji occurred during the later Heian court culture, a time when imperial ceremonies, aristocratic patronage of Buddhist institutions, and the influence of powerful noble families shaped political life. Although the emperor held formal authority, much day-to-day power was exercised by regents, retired emperors, and prominent clans. The person of Emperor Sutoku, who reigned during Daiji, figures in later accounts of mid‑12th century political struggles.

Chronology and succession

• Start: January 1126
• End: January 1131
• Reigning emperor: Sutoku-tennō
• Preceded by: Tenji
• Followed by: Tenshō

Years within the Daiji era were counted from the era’s first year onward; historians and primary sources commonly refer to events by these era-year notations when situating occurrences in the period’s chronology.

Although Daiji itself is not singled out by a single, widely noted landmark event in popular histories, it is part of the sequence of short, named eras that characterize Heian-period chronology and helps historians place cultural developments, court diaries, and temple records within a precise timeframe. Its place in the imperial calendar makes Daiji useful for dating literary works, religious donations, and official documents from the late Heian court.