via Khmer Times, 25 June 2018: The ancient graffiti of Angkor Wat is actually quite interesting and something I encountered while researching the invisible paintings a few years ago. The ‘graffiti’ – most of them inscriptions left behind by pilgrims – sheds light on the history of the temple during the post-Angkorian period and when the temple began to be seen as a Buddhist shrine rather than a Hindu one. Of course, leaving writing on the walls of the temples today is not only highly discouraged, it is downright illegal!
The foreign letters written on the stones of the Angkor Wat temple were written during the 17th century and before the 1990s.
Source: Angkor Wat temple graffiti causes stir – Khmer Times