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Yamaguchi Soken, also called Takejirō (Japanese:山口 素絢; 1759, Kyōto - 22 November 1818, Kyōto) was a Japanese painter of the Shijō school. He was one of the "Ten Great Ones" (応門十哲; a reference to the Ten Great Disciples of Confucius), taught by Maruyama Ōkyo.