23 October of every year is a national holiday in Thailand as it marks “King Chulalongkorn Day" or known in Thai as "Wan Piyamaharaj Day". It is the memorial day of the passing away of King Chulalongkorn, otherwise known as King Rama V. King Chulalongkorn led several major reforms in Thailand, for example in the areas of Thai educational system, military affairs, State Railway and Slave Liberation Act without bloodshed in Thailand.
this text is from the Royal Thai Embassy in Singapore.
The most important royal contribution was the announcement of Slave Abolition Act. Slave Abolition made him the Beloved Great King of all people of Siam.
this text and images are from Thailand Life.