Baron was an admiral of the early modern

Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender ...

Biography

Tomioka was the eldest son of a

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 ...

in the service of

Matsushiro Domain 300px, Matsushiro Castle Part of the Matsushiro domain's Edo estate, relocated to Kamakura and used as a hall at Ryuko-ji Temple was a feudal domain under the Tokugawa shogunate of Edo period Japan. It is located in Shinano Province, Hon ...

, in what is now part of

Nagano Prefecture is a landlocked prefecture of Japan located in the Chūbu region of Honshū. Nagano Prefecture has a population of 2,052,493 () and has a geographic area of . Nagano Prefecture borders Niigata Prefecture to the north, Gunma Prefecture to the ...

. In September 1876, Tomioka enrolled in the 5th class of the Imperial Japanese Naval Academy and graduated at the top of his class. In 1878 he was sent as a cadet to serve on the

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...

warship HMS ''Audacious''. After his return to Japan, he graduated from the Navy Staff College. During the

First Sino-Japanese War The First Sino-Japanese War (25 July 1894 – 17 April 1895) was a conflict between China and Japan primarily over influence in Korea. After more than six months of unbroken successes by Japanese land and naval forces and the loss of the po ...

, Tomioka served as

executive officer An executive officer is a person who is principally responsible for leading all or part of an organization, although the exact nature of the role varies depending on the organization. In many militaries and police forces, an executive officer, o ...

on the cruiser . He subsequently served as captain of the dispatch ship , instructor at the Imperial Japanese Naval Academy, captain of the cruiser and of the battleship and director of the 1st Bureau of the Imperial Japanese Navy General Staff. Tomioka was promoted to

rear admiral Rear admiral is a senior naval flag officer rank, equivalent to a major general and air vice marshal and above that of a commodore and captain, but below that of a vice admiral. It is regarded as a two star "admiral" rank. It is often regarde ...

in July 1903. During the

Russo-Japanese War The Russo-Japanese War ( ja, 日露戦争, Nichiro sensō, Japanese-Russian War; russian: Ру́сско-япóнская войнá, Rússko-yapónskaya voyná) was fought between the Empire of Japan and the Russian Empire during 1904 and 1 ...

, he was on the same strategy planning team as

Akiyama Saneyuki was a Meiji-period career officer in the Imperial Japanese Navy. He was famous as a planner of Battle of Tsushima in the Russo-Japanese War. The Japanese general Akiyama Yoshifuru was his elder brotherDupuy, Encyclopedia of Military Biography an ...

, and served as commandant of the Imperial Japanese Naval Academy. After the war, he was made commander in chief of the Training Fleet and promoted to vice admiral in March 1907. Tomioka was ennobled with the title of

baron Baron is a rank of nobility or title of honour, often hereditary, in various European countries, either current or historical. The female equivalent is baroness. Typically, the title denotes an aristocrat who ranks higher than a lord or knig ...

(''danshaku'') under the ''

kazoku The was the hereditary peerage of the Empire of Japan, which existed between 1869 and 1947. They succeeded the feudal lords () and court nobles (), but were abolished with the 1947 constitution. Kazoku ( 華族) should not be confused with ' ...

'' peerage system in September 1907. After serving as commander in chief of the

Takeshiki Guard District The was a navy base for the Imperial Japanese Navy located in the former (now part of present-day Tsushima, Nagasaki), on Tsushima Island, during the Russo-Japanese War. The Takeshiki Guard District was responsible for the control of the strateg ...

and the

Ryojun Guard District The was the major navy base for the Imperial Japanese Navy in the Kwantung Leased Territory before and during Second Sino-Japanese War. Located in at Ryojun ), (present-day Lüshunkou, China, The Ryojun Guard District was responsible for control ...

, he entered the reserves in December 1911. From 1914 until his death in July 1917, Tomioka was vice-chairman of the Imperial Serviceman’s Association. His son Sadatoshi Tomioka was also an admiral, serving in

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

References

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External links

Notes

{{DEFAULTSORT:Tomioka, Sadayasu 1854 births 1917 deaths People from Nagano Prefecture Imperial Japanese Navy admirals Kazoku Japanese military personnel of the First Sino-Japanese War Japanese military personnel of the Russo-Japanese War People of Meiji-period Japan