Okakura Kakuzō
In 1889, Yokoyama enrolled in the first graduating class of the "Tōkyō Bijutsu Gakkō" (the predecessor to the Tokyo National University of Fine Arts and Music), which had just been opened by Okakura Kakuzō (aka Okakura Tenshin). In school, he studied under the Kanō school artist Hashimoto Gahō. Several of his classmates also later became famous artists: Hishida Shunsō, Shimomura Kanzan, and Saigō Kogetsu.