A brief but exceptionally violent civil conflict known as the Hōgen Rebellion erupted in Kyoto over a bitter succession dispute between Emperor Go-Shirakawa and the retired Emperor Sutoku. The conflict drew in the rival samurai clans of Taira and Minamoto, effectively shattering the political dominance of the civilian court aristocrats and initiating the rise of the warrior class. The subsequent brutal executions and political exile of top nobles induced a profound cultural sense of despair, signaling to many the arrival of Mappō—the Buddhist age of spiritual degeneration.

The psychological trauma of the Hōgen Rebellion fundamentally reshaped Japanese aesthetic and poetic philosophy, embedding a dark, melancholic focus on impermanence (mujo) into Waka poetry. Exiled elites, including the defeated Emperor Sutoku, composed heartbreaking poems using natural metaphors to express spiritual isolation and political ruin. This crisis laid the cultural and spiritual foundation for the development of Buddhist recluse literature and the epic narrative style of the Heike Monogatari.