First introduced by King Vajiravudh (RamaVI) in 1917, the flag succeeded an earlier design that featured a white elephant on a red background. Comprising five horizontal bands of red, white and blue, the outer bands of red symbolize the nation, enclosing equal inner bands of white, representing religion. The blue band, occupying the central one-third of the total area, symbolizes the monarchy. The design expresses the complementary nature of these pillars of Thailand’s society.
Source: Thailand Executive Diary 2008