The word phlapphla means 'pavilion' and "Wat Phlapphla Chai" translates to 'Victory Pavilion Temple', referring to the pavilion of King Phutthayotfa Chulalok (Rama I), which was set up in the area while he was Chao Phraya Maha Kasat Suek (his highest title before becoming king), having returned from a war against the Khmers in 1782.
It was not built straight due to obstruction by the Meng Soon Building, whose owner was under the protection of France, which had extraterritorial rights, and did not allow his land to be expropriated.
Chinese businessman Hong Taechawanit donated his mansion in Phlapphla Chai to the government and it became the present-day Phlapphlachai Police Station.
His yelling caused crowds to gather at Phlapphla Chai Police Station, eventually escalating into a riot and spread to nearby areas such as Hua Lamphong, the 22 July Circle, King Chulalongkorn Memorial Hospital, Rama IV Road, and Wang Burapha.
Protesters burned public places, threw bombs, and fired at police officers, who were unable to control the situation.