Duong (born 1796—died Oct. 19, 1860, Oudong, Cambodia) was the king of Cambodia by 1841, formally invested in 1848, the last Cambodian king to reign before the French-imposed protectorate.
Duong was the younger brother of King Chan II, who had ruled uncertainly in joint vassalage to Siam (Thailand) and Vietnam. Between 1841 and 1847 these two neighbours confronted each other in Cambodia in alternating periods of war and uneasy truce. With neither able to gain a decisive victory, they agreed to a dual hegemony over the Khmer state. By mutual agreement, Duong was crowned king at the new capital, Oudong (Ŏdŏngk), in 1848.
Duong’s reign is idealized by modern Cambodians for the efforts he made to revitalize the state at a time when his more powerful neighbours were preoccupied with other concerns. To a considerable extent, however, his hopes were frustrated by the poverty of the state and by internal dissension. Duong showed his awareness of the outside world in his efforts to enlist assistance from Singapore to combat pirates operating along the Cambodian coast. Contrary to the assertions of French authors writing in the colonial period, Duong did not seek the imposition of a French protectorate over his country. In the face of multiple problems he agreed to explore the possibility of some ill-defined relationship with France, but his death in 1860 came before any consideration to such an agreement had taken place. The French advance into Cambodia came in 1863 and 1864, after Duong’s death, while his successor, Norodom, was on the throne.
Despite his own personal energy, Duong was at best able to preserve a shakily independent Cambodia. In the closing years of his reign there were already signs of dissension between his sons, and the kingdom was troubled by revolts by the Chams and the Malays living in the southeastern part of the state.