Fujiwara no Hidesato slew Taira no Masakado at the Battle of Kojima in 940, his arrow finding the rebel emperor through divine aid, ending Masakado's uprising and unleashing his vengeful spirit upon the land.
The Three Great Onryō are Japan's most dreaded vengeful spirits — Sugawara no Michizane, Taira no Masakado, and Emperor Sutoku — each wronged in life, each so terrible in death that their wrath reshaped history and their spirits demanded perpetual propitiation.
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