In the Genkō Incident of 1331, Emperor Go-Daigo's plans were again discovered, this time by a betrayal by his close associate Yoshida Sadafusa. He quickly hid the Sacred Treasures in a secluded castle in Kasagiyama (the modern town of Kasagi, Sōraku District, Kyōto Prefecture) and raised an army, but the castle fell to the shogunate's army the following year, and they enthroned Emperor Kōgon, exiling Daigo to Oki Province (the Oki Islands in modern-day Shimane Prefecture), the same place to which Emperor Go-Toba had been exiled after the Jōkyū War of 1221.