Arai Ōsui (新井奥邃) (1846–1922) was a prominent Japanese disciple of the 19th century cult leader, Thomas Lake Harris. He was originally a samurai in the service of one of the northern clans who fought in the Boshin War. He saw service before and during the Tokugawa shogunate's final battle at Hakodate.
Source: “Arai Ōsui”, English Wikipedia (CC BY-SA 4.0), excerpt