Sơn Ngọc Thành (; 7 December 1908 – 8 August 1977) was a Cambodian nationalist and republican politician, with a long history as a rebel leader and (for brief periods) a government minister.
Early life
Thanh was born in
Trà Vinh, Vietnam, to a mother of both Chinese and
Vietnamese ancestry and a
Khmer Krom father.
[: "The first of the Khmer Krom to arrive on the scene in Phnom Penh was Son Ngoc Thanh. Thanh had been born in Cochinchina, and his father was a Khmer Krom landowner, while his mother was from a Chinese-Vietnamese family."] He was educated in
Saigon
Ho Chi Minh City (HCMC) ('','' TP.HCM; ), commonly known as Saigon (; ), is the most populous city in Vietnam with a population of around 14 million in 2025.
The city's geography is defined by rivers and canals, of which the largest is Saigo ...
,
Montpellier
Montpellier (; ) is a city in southern France near the Mediterranean Sea. One of the largest urban centres in the region of Occitania (administrative region), Occitania, Montpellier is the prefecture of the Departments of France, department of ...
and
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
, studying law for a year before returning to Indochina. He found work as a magistrate in
Pursat and as a public prosecutor in
Phnom Penh before becoming Deputy Director of the Buddhist Institute.
Along with another prominent early Khmer nationalist,
Pach Chhoeun, he established the first
Khmer language
Khmer ( ; , Romanization of Khmer#UNGEGN, UNGEGN: ) is an Austroasiatic language spoken natively by the Khmer people. This language is an official language and national language of Cambodia. The language is also widely spoken by Khmer people i ...
newspaper, ''Nagaravatta'', in 1936. The political outlook of ''Nagaravatta'', which urged Khmers to break the commercial monopoly of foreign traders by starting their own businesses, was to make Thanh and his colleagues receptive to Japanese fascism, or as he termed it, "National Socialism".
Thanh's ideology was essentially
republican, right-wing, and modernising in outlook, which was to make him a longstanding opponent of the King
Norodom Sihanouk. Despite his nationalism, he was also a strong advocate of
pan-Asian cooperation, and advocated the teaching of the
Vietnamese language
Vietnamese () is an Austroasiatic languages, Austroasiatic language Speech, spoken primarily in Vietnam where it is the official language. It belongs to the Vietic languages, Vietic subgroup of the Austroasiatic language family. Vietnamese is s ...
in Cambodian schools, as it was a potential conduit for modernising ideas.
Involvement in government
After demonstrations against the French in July 1942, Thanh fled to
Japan
Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...
, returning when Sihanouk declared Cambodia's independence on 12 March 1945, during the Japanese occupation. He was made Foreign Minister. In August with the surrender of Japan, Thanh made himself Prime Minister. With the restoration of French control in October, he was arrested, and sent into exile first in Saigon and then in France.
Many of his supporters joined the
Khmer Issarak resistance to fight the colonial power. In 1951, the authorities brought Thanh back, to considerable popular acclaim; refusing a Cabinet position, he made alliances with various leaders of the Khmer Issarak rebels, and established another newspaper (''Khmer Kraok'') which advocated revolt against the French administration and was quickly banned. In 1952, accompanied by his lieutenant
Ea Sichau (a French-educated customs official and leftist intellectual) and a number of supporters, Thanh disappeared into the forests in the area of
Siem Reap, and began to organise resistance.
The Issarak movement was split between the
Khmer National Liberation Committee, the more overtly leftist
United Issarak Front, and a variety of regional warlords and guerrilla leaders. Thanh attempted to gain overall control of the movement throughout the early 1950s; a few of the movement's leaders, such as Prince
Norodom Chantaraingsey and
Puth Chhay, temporarily supported his overall leadership. By 1954, however, he had been increasingly sidelined by the leftists, and received overtures from the U.S.
Central Intelligence Agency
The Central Intelligence Agency (CIA; ) is a civilian foreign intelligence service of the federal government of the United States tasked with advancing national security through collecting and analyzing intelligence from around the world and ...
, who would fund many of his activities in future.
Though Thanh retained a high degree of support amongst the Khmer Krom, in subsequent years he would have relatively little influence or popular support within Cambodian domestic politics, especially as Sihanouk's
Sangkum movement absorbed most centrist and rightist elements.
Khmer Serei
The
First Indochina War ended in 1954. From his base near Siem Reap, Thanh organized the
Khmer Serei
The Khmer Serei ( ; "Free Khmer") were an anti-communist and anti- monarchist guerrilla force founded by Cambodian nationalist Son Ngoc Thanh. In 1959, he published 'The Manifesto of the Khmer Serei' claiming that Sihanouk was supporting the ...
militia, mainly recruited from amongst the Khmer Krom, to fight Sihanouk, who had come to regard Thanh as one of his greatest enemies. In his 1959 "Manifesto" of the Khmer Serei, Thanh charged Sihanouk with allowing the "Communistization" of Cambodia at the hands of
North Vietnam
North Vietnam, officially the Democratic Republic of Vietnam (DRV; ; VNDCCH), was a country in Southeast Asia from 1945 to 1976, with sovereignty fully recognized in 1954 Geneva Conference, 1954. A member of the communist Eastern Bloc, it o ...
.
The Khmer Serei operated in the border areas of Thailand and South Vietnam, making clandestine anti-Sihanouk radio broadcasts, but made little headway, although they were suggested as a source of military power in a number of coup plots (such as the
Bangkok Plot). After the Cambodian military and
Lon Nol overthrew Sihanouk in 1970, Thanh was invited to participate in the new
Khmer Republic government - initially as an adviser to the Acting Head of State,
Cheng Heng - and put his Khmer Serei troops at its service.
Lon Nol's anti-Communist Government of the
Khmer Republic (1970 - 1975) was claiming the
Mekong Delta
The Mekong Delta ( or simply ), also known as the Western Region () or South-western region (), is the list of regions of Vietnam, region in southwestern Vietnam where the Mekong, Mekong River River delta, approaches and empties into the sea th ...
(Southwestern Vietnam) from South Vietnam, raising an unwelcome question to the anti-Communist Government of the
South Vietnam
South Vietnam, officially the Republic of Vietnam (RVN; , VNCH), was a country in Southeast Asia that existed from 1955 to 1975. It first garnered Diplomatic recognition, international recognition in 1949 as the State of Vietnam within the ...
Republic but fully satisfying the Khmer Krom organization's expectations.
In 1972, Thanh again became Prime Minister, succeeding to
Sisowath Sirik Matak, but after being the target of a bomb attack (possibly organised by Lon Nol's brother,
Lon Non) he was soon dismissed by Lon Nol and exiled himself to South Vietnam.
Thanh was arrested by the
Viet Cong after the
Fall of Saigon, and died in custody in
Chi Hoa Prison in Ho Chi Minh City due to illness on 8 August 1977.
See also
*
Nguon Hong
References
Bibliography
*
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{{DEFAULTSORT:Son, Ngoc Thanh
1908 births
1977 deaths
20th-century Cambodian politicians
Cambodian anti-communists
Cambodian collaborators with Imperial Japan
Cambodian exiles
Cambodian nationalists
Cambodian people imprisoned abroad
Cambodian politicians of Chinese descent
Cambodian people of Vietnamese descent
Cambodian people who died in prison custody
Cambodian republicans
Foreign ministers of Cambodia
Government ministers of Cambodia
Khmer Krom people
People from Trà Vinh province
Prime ministers of Cambodia
Prisoners who died in Vietnamese detention
World War II political leaders
Khmer Republic
Heads of government who were later imprisoned