Overview
The Yōrō era (養老) was a Japanese era name or nengō that ran from November 717 through February 724. It followed the Reiki era (Reiki) and preceded the Jinki era (Jinki). The period corresponds to the later part of Empress Genshō's reign. As with other nengō, the name Yōrō was chosen from classical sources and intended to mark an auspicious turn in imperial government.
Political and administrative context
The Yōrō years fall within the broad transition from the Asuka to the early Nara period, when the central state consolidated its institutions. Court officials continued to implement and refine the ritsuryō system of centralized administration and law. The era is best known for legal and bureaucratic work aimed at regularizing provincial governance, taxation, and personnel appointments under imperial authority.
Yōrō Code (Yōrō-ritsuryō)
A defining achievement associated with this period is the compilation and finalization of what historians call the Yōrō Code. Completed in the early years of the era, this code revised and supplemented earlier legal collections and helped to systematize criminal and administrative regulations (the ritsu and ryō). While the text circulated in subsequent centuries mainly through copies and references, its provisions influenced how the court and provincial offices operated.
Cultural and foreign relations
During Yōrō, Japan sustained cultural and diplomatic links with Tang China, adopting administrative models, scriptural scholarship, and Buddhist learning that informed court culture and statecraft. Monastic institutions and official schools contributed to literacy and record-keeping necessary for implementing legal reforms.
Calendar, naming, and legacy
The use of era names like Yōrō reflects an East Asian practice of periodizing reigns and events. Converting nengō dates into modern Gregorian years requires accounting for the older lunisolar calendar. The Yōrō era's principal legacy is its role in consolidating legal-administrative norms; elements of the Yōrō Code and the bureaucratic patterns of this time continued to influence Japanese governance through the Nara period and beyond.
- Dates: November 717 – February 724.
- Preceded by: Reiki.
- Succeeded by: Jinki.
- Reigning sovereign: Empress Genshō.
For readers seeking more detail on era names, legal history, or the reign of Empress Genshō, consult specialized histories of the Nara period and works on the ritsuryō state. Primary texts and archaeological evidence provide the basis for reconstructing administrative practices from this formative era.