The Shishigatani incident (Japanese: 鹿谷の変, Shishigatani no hen) was a political conspiracy in late‑15th‑century Japan during the Muromachi period. Contemporary records indicate that a group of court nobles, provincial warlords, and Buddhist clergy plotted to overthrow the ruling Ashikaga shogunate. The conspirators are reported to have convened at a villa in the Shishigatani district, which gave the incident its name.
Background
The incident occurred against a backdrop of increasing factional rivalry within the Ashikaga administration. By the 1470s, the shogunate’s authority was weakened by disputes among leading samurai families, notably the Hosokawa and Yamana clans, and by financial strain on the imperial court. Dissatisfaction among certain aristocratic and religious circles fostered an environment in which a plot to replace the shogun with a more amenable figure could be contemplated.
The Plot
According to the Taiheiki and other contemporary chronicles, the conspirators included members of the Hatakeyama clan, a number of court nobles (kuge), and senior monks from influential temples. Their objective was to depose the shogun Ashikaga Yoshimasa and install a successor who would restore stability and protect their interests. Detailed plans for the coup remain unclear; the sources emphasize the secrecy of the meetings held at Shishigatani and the involvement of a network of supporters across several provinces.
Discovery and Suppression
The plot was uncovered by Hosokawa Masamoto, the shogunate’s kanrei (deputy shogun). Acting on intelligence gathered from informants, Masamoto ordered the arrest of the principal conspirators in early 1475 (exact date varies among sources). Those captured were either executed, placed under house arrest, or exiled to remote provinces. Lesser participants faced confiscation of lands and titles. The swift suppression of the conspiracy demonstrated the shogunate’s capacity to respond to internal threats, albeit temporarily.
Aftermath
Although the Shishigatani incident failed to achieve its immediate goal, it contributed to the broader climate of instability that culminated in the Ōnin War (1467–1477) and the subsequent Sengoku period of civil war. The episode is frequently cited by historians as an example of the deepening fissures within the Ashikaga government and the growing influence of regional daimyōs and religious institutions in political affairs.
Historical Assessment
Modern scholarship treats the Shishigatani incident as a documented, though relatively minor, episode in the late Muromachi era. The limited number of primary sources—principally the Taiheiki and a few temple records—means that many specifics of the conspiracy, such as the exact number of participants and the full scope of their plans, remain uncertain. Consequently, while the existence of the incident is well attested, details beyond the broad outline are subject to scholarly interpretation.