Genkō (元弘) is the Japanese era name (nengō) that ran from August 1331 through January 1334. The name succeeded Gentoku and preceded the Kemmu era. As an era title it marks a short but pivotal period of military and political upheaval on the eve of the Nanboku-chō (Northern and Southern Courts) era; the era label itself is part of Japan's system of year names, the nengō, used to organize imperial chronology and official records.

Political context and rival claimants

The Genkō years coincided with Emperor Go‑Daigo's challenge to the ruling Kamakura bakufu. The court-centered conflicts of this time led to competing centers of authority: the court in Kyoto aligned with a figure installed by the shogunate, often described as a pretender in contemporary accounts, while Go‑Daigo attracted supporters who later formed an opposing court. After the collapse of Kamakura the imperial schism developed into what historians call the Southern Court centered around Yoshino; the name Southern Court is applied to Go‑Daigo's line, which took refuge in Yoshino, and its rival claims are associated with the Kyoto-based line. The central figure of the rebellion was Emperor Go‑Daigo, whose actions during Genkō reshaped the monarchy's role.

Major events and outcomes

Key events in the Genkō era include the Genkō War (often dated 1331–1333), the armed uprising against Kamakura rule, and the eventual fall of the Kamakura shogunate in 1333. Military leaders such as Ashikaga Takauji played crucial roles in these campaigns. The overthrow of the bakufu briefly enabled Go‑Daigo to attempt a restoration of direct imperial rule — the Kenmu Restoration — and this immediate aftermath is conventionally placed in the succeeding Kemmu era.

  • August 1331: beginning of Genkō, following Gentoku.
  • 1331–1333: widespread rebellion and the Genkō War.
  • 1333: fall of the Kamakura shogunate and temporary imperial restoration.
  • January 1334: end of the Genkō era and transition to Kemmu.

Although Genkō covers only a few years, its importance lies in its role as the immediate lead-up to the prolonged period of dynastic rivalry known as the Nanboku‑chō. The disputes over legitimacy that intensified during and after Genkō resulted in rival courts and a contested chronology that later historians have carefully parsed. For concise background on the era name and how it is used in chronology, see discussions of the nengō system and the period labels for the pre‑Nanboku‑chō decades (pre‑Nanboku‑chō context).

For readers seeking primary-source compilations, dynastic genealogies, or archaeological overviews tied to this moment, specialized collections and modern commentaries remain the most reliable guides to the complex events bracketed by the Genkō era.