was an admiral in the

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, Potsdam Declaration, when it was dissolved followin ...

, and cabinet minister in the wartime government of the

Empire of Japan The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation state that existed from the Meiji Restoration on January 3, 1868, until the Constitution of Japan took effect on May 3, 1947. From Japan–Kor ...

Background

Sakonji was born in

Yonezawa Yonezawa City Hall is a city in Yamagata Prefecture, Japan. , the city had an estimated population of 81,707 in 33,278 households, and a population density of 150 persons per km2. The total area of the city is . Yonezawa is most famous for i ...

Yamagata Prefecture is a Prefectures of Japan, prefecture of Japan located in the Tōhoku region of Honshu. It has a population of 1,005,926 (1 February 2025) and an area of 9,325 Square kilometre, km2 (3,600 Square mile, sq mi). Its neighbours are Akita Prefectu ...

, where his father had been a

samurai The samurai () were members of the warrior class in Japan. They were originally provincial warriors who came from wealthy landowning families who could afford to train their men to be mounted archers. In the 8th century AD, the imperial court d ...

in the service of the

Yonezawa Domain was a feudal domain in Edo period Japan, located in Dewa Province (modern-day Yamagata Prefecture), Japan. It was centered at Yonezawa castle in what is now the city of Yonezawa, and its territory extended over the Okitama District of Dewa Pr ...

. However, soon after his birth, the family relocated to

Kanazawa, Ishikawa is the capital of Ishikawa Prefecture in central Japan. , the city had an estimated population of 466,029 in 203,271 households, and a population density of 990 persons per km2. The total area of the city was . Etymology The name "Kanazawa" ...

, and then to

Osaka is a Cities designated by government ordinance of Japan, designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the List of cities in Japan, third-most populous city in J ...

, where Sakonji was adopted by his uncle, who was a lawyer. After attending military preparatory schools, he entered the 28th class of the

Imperial Japanese Naval Academy The was a school established to train line officers for the Imperial Japanese Navy. It was originally located in Nagasaki, moved to Yokohama in 1866, and was relocated to Tsukiji, Tokyo, in 1869. It moved to Etajima, Hiroshima, in 1888. Students ...

and graduated 8th of the 105 cadets in his class in December 1900. He served his midshipman assignment on the cruiser , which made along-distance navigational training voyage to

Manila Manila, officially the City of Manila, is the Capital of the Philippines, capital and second-most populous city of the Philippines after Quezon City, with a population of 1,846,513 people in 2020. Located on the eastern shore of Manila Bay on ...

, Batavia,

Singapore Singapore, officially the Republic of Singapore, is an island country and city-state in Southeast Asia. The country's territory comprises one main island, 63 satellite islands and islets, and one outlying islet. It is about one degree ...

Bangkok Bangkok, officially known in Thai language, Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies in the Chao Phraya River delta in central Thailand and has an estim ...

Hong Kong Hong Kong)., Legally Hong Kong, China in international treaties and organizations. is a special administrative region of China. With 7.5 million residents in a territory, Hong Kong is the fourth most densely populated region in the wor ...

Incheon Incheon is a city located in northwestern South Korea, bordering Seoul and Gyeonggi Province to the east. Inhabited since the Neolithic, Incheon was home to just 4,700 people when it became an international port in 1883. As of February 2020, ...

Busan Busan (), officially Busan Metropolitan City, is South Korea's second list of cities in South Korea by population, most populous city after Seoul, with a population of over 3.3 million as of 2024. Formerly romanized as Pusan, it is the economi ...

and

Vladivostok Vladivostok ( ; , ) is the largest city and the administrative center of Primorsky Krai and the capital of the Far Eastern Federal District of Russia. It is located around the Zolotoy Rog, Golden Horn Bay on the Sea of Japan, covering an area o ...

in 1901. As an ensign, he was assigned to the cruiser as chief navigator. He served in combat in the

Russo-Japanese War The Russo-Japanese War (8 February 1904 – 5 September 1905) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and the Korean Empire. The major land battles of the war were fought on the ...

torpedo boat A torpedo boat is a relatively small and fast naval ship designed to carry torpedoes into battle. The first designs were steam-powered craft dedicated to ramming enemy ships with explosive spar torpedoes. Later evolutions launched variants of ...

s, becoming a torpedo warfare specialist after the war. Promoted to commander in 1915, he led the training squadron on a long distance navigational training cruise to the South Pacific, Australia and New Zealand in 1916. During

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

, he was sent to the

Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...

and the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

as a

military attaché A military attaché or defence attaché (DA),Defence Attachés
''Geneva C ...

to observe modern western warfare firsthand. He was promoted to captain in 1919, and served on the Japanese delegation to the

Treaty of Versailles The Treaty of Versailles was a peace treaty signed on 28 June 1919. As the most important treaty of World War I, it ended the state of war between Germany and most of the Allies of World War I, Allied Powers. It was signed in the Palace ...

. On his return to Japan, he was assigned to the

Imperial Japanese Navy General Staff The was the highest organ within the Imperial Japanese Navy (IJN). In charge of planning and operations, it was headed by an Admiral headquartered in Tokyo. History Created in 1893, the Navy General Staff took over operational (as opposed to a ...

. He later returned to sea in December 1923 as captain of the battleship and was promoted to rear admiral in 1924 and vice admiral in 1928.''Japanese Biographical Encyclopedia'' 2009 Kodansha (in Japanese) In 1929, he was an influential member of the Japanese delegation at the

London Naval Treaty The London Naval Treaty, officially the Treaty for the Limitation and Reduction of Naval Armament, was an agreement between the United Kingdom, Empire of Japan, Japan, French Third Republic, France, Kingdom of Italy, Italy, and the United Stat ...

negotiations. On his return to Japan in 1930, he became commander of the Training Fleet, and personally led a training voyage in 1931, going from

Keelung Keelung ( ; zh, p=Jīlóng, c=基隆, poj=Ke-lâng), Chilung or Jilong ( ; ), officially known as Keelung City, is a major port city in northeastern Taiwan. The city is part of the Taipei–Keelung metropolitan area with neighboring New Ta ...

to Hong Kong, Singapore,

Colombo Colombo, ( ; , ; , ), is the executive and judicial capital and largest city of Sri Lanka by population. The Colombo metropolitan area is estimated to have a population of 5.6 million, and 752,993 within the municipal limits. It is the ...

Aden Aden () is a port city located in Yemen in the southern part of the Arabian peninsula, on the north coast of the Gulf of Aden, positioned near the eastern approach to the Red Sea. It is situated approximately 170 km (110 mi) east of ...

Port Said Port Said ( , , ) is a port city that lies in the northeast Egypt extending about along the coast of the Mediterranean Sea, straddling the west bank of the northern mouth of the Suez Canal. The city is the capital city, capital of the Port S ...

Naples Naples ( ; ; ) is the Regions of Italy, regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 908,082 within the city's administrative limits as of 2025, while its Metropolitan City of N ...

Toulon Toulon (, , ; , , ) is a city in the Provence-Alpes-Côte d'Azur region of southeastern France. Located on the French Riviera and the historical Provence, it is the prefecture of the Var (department), Var department. The Commune of Toulon h ...

Marseilles Marseille (; ; see below) is a city in southern France, the prefecture of the department of Bouches-du-Rhône and of the Provence-Alpes-Côte d'Azur region. Situated in the Provence region, it is located on the coast of the Mediterranean S ...

Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...

Alexandria Alexandria ( ; ) is the List of cities and towns in Egypt#Largest cities, second largest city in Egypt and the List of coastal settlements of the Mediterranean Sea, largest city on the Mediterranean coast. It lies at the western edge of the Nile ...

Djibouti Djibouti, officially the Republic of Djibouti, is a country in the Horn of Africa, bordered by Somalia to the south, Ethiopia to the southwest, Eritrea in the north, and the Red Sea and the Gulf of Aden to the east. The country has an area ...

, Colombo, Batavia, Manila,

Palau Palau, officially the Republic of Palau, is an island country in the Micronesia subregion of Oceania in the western Pacific Ocean. The Republic of Palau consists of approximately 340 islands and is the western part of the Caroline Islands ...

and Sasebo. In 1931, he became Vice-Minister of the Navy. In 1932, Sakonji became commander in chief of the

IJN 3rd Fleet The was a fleet of the Imperial Japanese Navy (IJN), which was created, and subsequently disbanded on six separate occasions and revived on five separate occasions. History Russo-Japanese War First established on 28 December 1903, the 3rd Flee ...

, and of the

Sasebo Naval District was the third of five main administrative districts of the pre-war Imperial Japanese Navy. Its territory included the western and southern coastline of Kyūshū, the Ryukyu Islands, Taiwan and Korea, as well as patrols in the East China Sea and t ...

. Sakonji had made a very favorable impression on the Commander in Chief of the

Combined Fleet The was the main sea-going component of the Imperial Japanese Navy. Until 1933, the Combined Fleet was not a permanent organization, but a temporary force formed for the duration of a conflict or major naval maneuvers from various units norm ...

Suzuki Kantarō is a Japanese multinational mobility manufacturer headquartered in Hamamatsu, Shizuoka. It manufactures automobiles, motorcycles, all-terrain vehicles (ATVs), outboard marine engines, wheelchairs and a variety of other small internal combu ...

due to his strong negotiating position during the London Naval Treaty negotiations and subsequent support for the

Treaty Faction The was an unofficial and informal political faction within the Imperial Japanese Navy in the 1920s–1930s of officers supporting the Washington Naval Treaty. Background The ''Washington Naval Treaty'', also known as the ''Five-Power Treaty'' ...

within the Imperial Japanese Navy.Asada. ''From Mahan to Pearl Harbor'', page 144 Nevertheless, Sakonji earned the enmity of influential

Fleet Faction The Fleet Faction () was an informal political faction within the Imperial Japanese Navy active in the 1920s and 1930s. The ''kantai-ha'' sought to drastically increase the size of the Imperial Japanese Navy in order to reach force parity with th ...

leader,

Prince Fushimi Hiroyasu was a scion of the Japanese imperial family and a career naval officer who served as chief of staff of the Imperial Japanese Navy from 1932 to 1941. Early life Prince Hiroyasu was born in Tokyo as Prince Narukata, the eldest son of Prince F ...

, and Sakonji was effectively forced into the reserves in March 1934. Subsequently, Sakonji served as president of the North Sakhalin Oil Company from July 1935 to July 1941. Sakonji was selected by

Prime Minister A prime minister or chief of cabinet is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. A prime minister is not the head of state, but r ...

Fumimaro Konoe was a Japanese politician who served as Prime Minister of Japan from 1937 to 1939 and from 1940 to 1941. He presided over the Japanese invasion of China in 1937 and breakdown in relations with the United States, which shortly after his t ...

to become Minister of Commerce and Industry in 1941. He was also granted a seat in the House of Peers in the

Diet of Japan , transcription_name = ''Kokkai'' , legislature = 215th Session of the National Diet , coa_pic = Flag of Japan.svg , house_type = Bicameral , houses = , foundation=29 November 1890(), leader1_type ...

from January 1943. Under Prime Minister Suzuki Kantarō in April 1945, he was again appointed to the Cabinet as a

Minister of State Minister of state is a designation for a government minister, with varying meanings in different jurisdictions. In a number of European countries, the title is given as an honorific conferring a higher rank, often bestowed upon senior minister ...

, where he worked to bring about an end to the war by urging acceptance of the

Potsdam Declaration The Potsdam Declaration, or the Proclamation Defining Terms for Japanese Surrender, was a statement that called for the surrender of all Japanese armed forces during World War II. On July 26, 1945, United States President Harry S. Truman, ...

. After the

surrender of Japan The surrender of the Empire of Japan in World War II was Hirohito surrender broadcast, announced by Emperor Hirohito on 15 August and formally Japanese Instrument of Surrender, signed on 2 September 1945, End of World War II in Asia, ending ...

, most members of the wartime Japanese cabinets were arrested for suspected

war crimes A war crime is a violation of the laws of war that gives rise to individual criminal responsibility for actions by combatants in action, such as intentionally killing civilians or intentionally killing prisoners of war, torture, taking hos ...

by the Allied occupation authorities. However, Sakonji was not prosecuted due to his efforts for peace at the end of the war. Following the

occupation of Japan Japan was occupied and administered by the Allies of World War II from the surrender of the Empire of Japan on September 2, 1945, at the war's end until the Treaty of San Francisco took effect on April 28, 1952. The occupation, led by the ...

, in 1951 Sakonji was asked to serve on the committee towards the establishment of the modern

Japan Maritime Self-Defense Force The , abbreviated , also simply known as the Japanese Navy, is the maritime warfare branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. The JMSDF was formed following the dissolution of the Imperial Japanese Navy ( ...

Notes

References

*Asada, Sadao. '' From Mahan to Pearl Harbor: The Imperial Japanese Navy and the United States '' . Naval Institute Press (2006) *Nakamura, Takafusa. '' A history of Shōwa Japan, 1926-1989 ''. Tokyo University Press (1998), *Braisted, William Reynolds. '' Diplomats in Blue: U.S. Naval Officers in China, 1922-1933''. University Press of Florida (2009),

External links

* {{DEFAULTSORT:Sakonji, Seizo 1879 births 1969 deaths Politicians from Yamagata Prefecture Government ministers of Japan Members of the House of Peers (Japan) Imperial Japanese Navy admirals Japanese businesspeople Japanese people of World War I