In 1904, Cambodia is the colony of French for survey the land to the northeast of Thailand, than result in demarcate the border between Siam and Indo-China. France use watershed is pervasive so Prasat Preah Vihear in the border regions of Thailand. But after that France not use watershed is pervasive for prepared a new map, so Prasat Preah Vihear belongs to Cambodia. After the Indochina war ended in 1942, Japan help Siam to reclaimed Siem Reap and Battambang, Prasat Preah Vihear belongs to Siam. However after World War II (1945) Axis Powers lose of the war (Germany, Japan, and Italy) Siam must return territory to Cambodia so Prasat Preah Vihear is in the Thailand - Cambodia border.
In 1947, the Siamese Government by Field Marshal Plaek Phibunsongkhram send Thai military to stand at Prasat Preah Vihear.
In 1954, The Battle of Dien Bien Phu marked the end of French in Indochina and At the Geneva Conference, the French agreement independence was granted to Cambodia. While The tumult of war, claimed Siam was the owner Prasat Preah Vihear so King Norodom Sihanouk of Cambodia reclaim it.
In 1959, Cambodia protested and asked the International Court of Justice to rule that the temple in June 15 and The court proceedings it's was Cambodia. Thailand Government can petitioner protests reviewed of Justice in 10 years but do not.
In march 2005, The Cambodian government has proposed the UNESCO for Prasat Preah Vihear as a World Heritage Site.
On May 14, 2008 Noppadon Pattama is Foreign Minister of Thailand meeting have 6 item agreements and signed without passing into consideration of the parliament with the Prime Minister of Cambodia to support register one-sidedly the Preah Vihear temple as a World Heritage Site.
On July 8, 2008 UNESCO decided to add Prasat Preah Vihear just only castle is the World Heritage Site.