Viscount
A viscount ( , for male) or viscountess (, for female) is a title used in certain European countries for a noble of varying status.
In many countries a viscount, and its historical equivalents, was a non-hereditary, administrative or judicial ...
was a Japanese
samurai
were the hereditary military nobility and officer caste of medieval and early-modern Japan from the late 12th century until their abolition in 1876. They were the well-paid retainers of the '' daimyo'' (the great feudal landholders). They h ...
of the late
Edo period
The or is the period between 1603 and 1867 in the history of Japan, when Japan was under the rule of the Tokugawa shogunate and the country's 300 regional '' daimyo''. Emerging from the chaos of the Sengoku period, the Edo period was characteriz ...
who became an influential member of the
Meiji era
The is an era of Japanese history that extended from October 23, 1868 to July 30, 1912.
The Meiji era was the first half of the Empire of Japan, when the Japanese people moved from being an isolated feudal society at risk of colonization b ...
government of Japan.
Early life
Yamao was born in Aio-Futajima, a village in
Chōshū domain
The , also known as the , was a domain (''han'') of the Tokugawa Shogunate of Japan during the Edo period from 1600 to 1871.Deal, William E. (2005) ''Handbook to Life in Medieval and Early Modern Japan,'' p. 81
The Chōshū Domain was base ...
(present day
Yamaguchi prefecture
is a Prefectures of Japan, prefecture of Japan located in the Chūgoku region of Honshu. Yamaguchi Prefecture has a population of 1,377,631 (1 February 2018) and has a geographic area of 6,112 Square kilometre, km2 (2,359 Square mile, sq mi). Y ...
), and received a traditional training as a Samurai. He was eager to learn science, and entered the
Egawa School in
Edo, then continued studying under