Constitution Defense Monument

The Constitution Defense Monument, also known as the Lak Si Monument and originally as the Rebellion Suppression Monument, was a public monument in Bangkok, Thailand. It was erected in 1936 to commemorate the victory of the new constitutional government over the Boworadet Rebellion in 1933, and stood in a plaza (later a traffic circle) on Phahonyothin Road in Bang Khen district in the city's northern fringe. While the monument was leveraged as a patriotic symbol for the post-absolute-monarchy state under Prime Minister Plaek Phibunsongkhram in the 1930s and 1940s, this narrative was challenged after the resurgence of the royalist faction following the 1947 coup d'état, and the monument gradually lost most of its political significance, until pro-democracy protest movements revived it as a focal point the 2010s. In 2018, the monument was secretly removed without explanation in what has been observed as part of a series of attempted erasure of the early post-absolute-monarchy People's Party government's architectural legacy.

The traffic circle in which the monument stood, known as Lak Si or Bang Khen Circle/Roundabout, forms the meeting point of Chaeng Watthana and Ram Inthra roads with Phahonyothin. It is now occupied by the elevated Wat Phra Sri Mahathat station, an interchange station of the Sukhumvit BTS and Pink MRT lines.