Ryuun Oyone (né Ryumoto Oyone; 1872 – June 26, 1916) was a Japanese serial killer and rapist, active during the Taishō era. Since many of his victims were bhikkhunī, the media nicknamed him The Nun Slayer.
Source: “Ryuun Daimai”, English Wikipedia (CC BY-SA 4.0), excerpt
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