Angkor
In the early days of Angkor, the worship of Vishnu was secondary to that of Shiva. The relationship seems to have changed with the construction of Angkor Wat by King Suryavarman II as his personal mausoleum at the beginning of the 12th century. The central religious image of Angkor Wat was an image of Vishnu, and an inscription identifies Suryavarman as "Paramavishnuloka," or "he who enters the heavenly world of Vishnu." Religious syncretism, however, remained thoroughgoing in Khmer society: the state religion of Shaivism was not necessarily abrogated by Suryavarman's turn to Vishnu, and the temple may well have housed a royal lingam. Furthermore, the turn to Vaishnavism did not abrogate the royal personality cult of Angkor. by which the reigning king was identified with the deity. According to Angkor scholar Georges Coedès, "Angkor Wat is, if you like, a vaishnavite sanctuary, but the Vishnu venerated there was not the ancient Hindu deity nor even one of the deity's traditional incarnations, but the king Suryavarman II posthumously identified with Vishnu, consubstantial with him, residing in a mausoleum decorated with the graceful figures of apsaras just like Vishnu in his celestial palace." Suryavarman proclaimed his identity with Vishnu, just as his predecessors had claimed consubstantiation with Shiva.
Henri Mouhot
Such quotations may have given rise to the popular misconception that Mouhot had found the abandoned ruins of a lost civilisation. The Royal Geographical Society and The Zoological Society, both interested in announcing new finds, seemed to have encouraged the rumor that Mouhot — whom they had sponsored to chart mountains and rivers and catalog new species — had discovered Angkor. Mouhot himself erroneously asserted that Angkor was the work of an earlier civilization than the Khmer. For although the very same civilization which built Angkor was alive and right before his eyes, he considered them in a "state of barbarism" and could not believe they were civilized or enlightened enough to have built it. He assumed that the authors of such grandeur were a disappeared race and mistakenly dated Angkor back over two millennia, to around the same era as Rome. The true history of Angkor Wat was later pieced together from the book "The Customs of Cambodia" written by Temür Khan's envoy Zhou Daguan to Cambodia in 1295-1296 and from stylistic and epigraphic evidence accumulated during the subsequent clearing and restoration work carried out across the whole Angkor site. It is now known that the dates of Angkor's habitation were from the early 9th to the early 15th centuries.