Phnom Bakheng at Angkor, Cambodia, is a Hindu temple in the form of a temple mountain. Dedicated to Shiva, it was built at the end of the 9th century, during the reign of King Yasovarman (889-910 A.D.). Located atop a hill, it is nowadays a popular tourist spot for sunset views of the much bigger temple Angkor Wat, which lies amid the jungle about 1.5 km to the southeast. The large number of visitors makes Phnom Bakheng one of the most threatened monuments of Angkor. Constructed more than two centuries before Angkor Wat, Phnom Bakheng was in its day the principal temple of the Angkor region, historians believe. It was the architectural centerpiece of a new capital, Yasodharapura, that Yasovarman built when he moved the court from the capital Hariharalaya in the Roluos area located to the southeast.
An inscription dated 1052 A.D. and found at the Sdok Kak Thom temple in present-day Thailand states in Sanskrit: "When Sri Yasovardhana became king under the name of Yasovarman, the able Vamasiva continued as his guru. By the king's order, he set up a linga on Sri Yasodharagiri, a mountain equal in beauty to the king of mountains. Scholars believe that this passage refers to the consecration of the Phnom Bakheng temple approximately a century and a half earlier.
Phnom Bakheng is one of three hilltop temples in the Angkor region that are attributed to Yasovarman's reign. The other two are Phnom Krom to the south near the Tonle Sap lake, and Phnom Bok, northeast of the East Baray reservoir.
Following Angkor's rediscovery by the outside world in the mid-19th Century, decades passed before archeologists grasped Phnom Bakheng's historical significance. For many years, scholars' consensus view was that the Bayon, the temple located at the center of Angkor Thom city, was the edifice to which the Sdok Kak Thom inscription referred. Later work identified the Bayon as a Buddhist site, built almost three centuries later than originally thought, in the late 12th Century, and Phnom Bakheng as King Yasovarman's state temple.