Прэахвихеа
The region later came under the influence of the Dvaravati culture, followed by the Khmer Empire. The latter built dozens of "prasats" (sanctuaries) throughout Isan. The most significant are at Phimai Historical Park and Phanom Rung Historical Park. Preah Vihear Temple was also considered to be in Isan, until the International Court of Justice in 1962 ruled that it belonged to Cambodia.