An 1856 record mentions the island: "... King Ang Duong (of Cambodia) apprise Mr. de Montigny, French envoy in visit to Bangkok, through the intermediary of Bishop Miche, his intention to yield Phu Quoc to France. Such a proposition aimed to create a military alliance with France to avoid the threat of Vietnam on Cambodia. The proposal did not receive an answer from the French.
While the war between Vietnam, France, and Spain was about to begin, Ang Duong sent another letter to Napoleon III to warn him on Cambodian claims on the lower Cochin china region: the Cambodian king listed provinces and islands, including Phu Quoc, under Vietnamese occupation for several years or decades (in the case of Saigon, some 200 years according to this letter). Ang Duong asked the French emperor to not annex any part of these territories because, as he wrote, despite this relatively long Vietnamese occupation, they remained Cambodian lands. In 1867, Phu Quoc's Vietnamese authorities pledged allegiance to French troops just conquering Hà Tiên.
After Cambodia gained independence from France, sovereignty disputes over the island were raised since there was no colonial decision on the island's fate. Dating back to 1939, the Governor-general of French Indochina, Jules Brévié had drawn a line to delimit the administrative boundaries for islands in the Gulf of Thailand: those north of the line were placed under the Cambodian protectorate; those south of the line were managed by the colony of Cochin china. Brévié made the point that the decision merely addressed police and administrative task, and that no sovereignty decision had been made. As a result, Phu Quoc remains under Cochin china administration.
Phu Quoc has been a sleepy historical backwater for most of its history. However, in the Twentieth Century, it was involved in a series of high-profile events.
After Mainland China fell under the control of the Chinese Communist Party in 1949, General Huang
