The central sanctuary, the surrounding galleries with gopuras (entrance pavilions), the staircases, the naga bridges, and the causeway were al built in early 12th century preceding Prasat Phimai and Angkor Wat a few decades.
''The Phanom Rung Inscriptions Nos. 7 and 9 from 1150 AD are from the end of the reign of Suriyavarman II (rule: 1113-1150) and refer to the families that were connected with Phanom Rung, especially Narendraditya who constructed the main temple and his son Hiranya who continued with the construction and also made the inscription in honour of his father. Narendraditya was of the Mahidharapura dynasty and played an important role in the campaigns of Suryavarman II and was rewarded with the governorships of cities under the power of the Mahidharapura dynasty. After his rise to power he built the main temple of Prasat Phanom Rung.'' (F.A.D.)