[1] In 1892, he attended the Law College of the Tokyo Imperial University, where his follow classmates included Natsume Sōseki, Masaoka Shiki, Akiyama Saneyuki and Minakata Kumagusu.

Yamaza's work in Japan's Foreign Ministry led to appointments as part of the resident staff in at the Japanese consulates in Pusan and Incheon in Korea.

[2] Back in Tokyo, Yamaza was promoted as the Director of the Political Affairs Bureau within the Foreign Ministry in 1901.

[1] In this context, some Korean scholars assert that Yamaza played a notable role in calling for incorporation of Liancourt Rocks within Japanese territorial claims.

[5] In 1908, Yamaza was councillor of the Japanese embassy in Great Britain, with responsibility for planning of Japan's participation in the London Naval Conference (1908–1909) and the Japan–British Exhibition in 1910.