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.