Okamoto Daihachi incident

The Okamoto Daihachi incident (岡本大八事件) of 1612 refers to the exposure of the intrigues involving the Japanese Christian daimyō and retainers of the early Tokugawa shogunate in Japan. The conspiracy - motivated by the Christian daimyō Arima Harunobu's desire to retake Arima lands in Hizen that were lost in the Sengoku wars - did much to shake the confidence that the Tokugawa regime placed on its Christian subjects, and was attributed as one of the reasons the Tokugawa eventually took an anti-Christian stance, which culminated in the persecution of Christians throughout the country.