Chau Sen Cocsal (, ; 1 September 1905 – 22 January 2009), also known as Chhum (Khmer: ឈុំ, ), was a Cambodian civil servant and politician who served as Prime Minister of Cambodia in 1962 and President of the National Assembly twice, in 1962–1963 and 1966–1968. He lived for , making him the longest-lived state leader in the world with the known date of birth and death. The only leader possibly longer living than him is another Cambodian prime minister, Ek Yi Oun (1910–2013). Chhum was awarded the honorary title "Samdech" in 1993 by King Norodom Sihanouk. Early life Chhum was born into an ethnic Khmer (Khmer Krom) family in the commune of Tri Tôn, Châu Đốc Province (today renamed as An Giang Province), French Indochina (present-day Vietnam), on 1 September 1905. Chhum attended primary school at Phnom Penh before moving to Saigon where he attended the Lycée Chasseloup Laubac. At the age of 21, Chhum became the first Cambodian to graduate there, with a baccalaureate in French and Philosophy. Upon graduation, he began a career in the French Colonial Administration in Phnom Penh, Cambodia, with the position of Second Class Civil Servant (Cadre Supérieur de Deuxième Classe / Anuk Montrei). Career In 1928, Chau Sen Cocsal was promoted Deputy Governor of Takéo Province (Gouverneur Adjoint), then successively posted in Tralach District, Takéo Province, in 1931 and Thbaung Khmaum, Kompong Cham Province, in 1935. In 1938, Chhum became Governor of Svay Rieng Province. From 1940 to 1944, he was Governor of Kompong Chhnang Province. During World War II, Chhum refused to supply forced labour to the Japanese occupying forces in Cambodia and joined resistance in the jungle. With the return of the French Administration, Chhum was nominated Mayor of Phnom Penh in 1945, Governor of Kompong Cham Province in 1946, then Governor of Kandal Province in 1948. In 1951, Chhum was sent to Thailand, as Cambodia's first ambassador to a foreign country. Chhum returned to Cambodia in 1952 and once more took to the jungle to fight for the country's independence from France. In 1955, Chau Sen Cocsal was elected to the Cambodian National Assembly as deputy of Kompong Cham Province. From 1958 to 1963, he occupied the position of President of the National Assembly. In 1969, at the age of 64, Chhum retired from public office. In April 1975, after the fall of Phnom Penh to the Khmer Rouge