柳田國男
Following the independence of Finland in 1917, he became Finland's first envoy to Japan, as a "Chargé d'affaires", from 1920 to 1929, during which he was a frequent guest lecturer at Tokyo Imperial University, where he influenced Kunio Yanagita, Izuru Shimura, Kyōsuke Kindaichi, and Shimpei Ogura. He acquired command of the Japanese language remarkably quickly.