the most important was the abolition of slavery. Most of the population of Thailand were slaves.
A Thai could buy their way out of slavery but the price was excessive and for the most part beyond the slaves means to pay, making them a slave for life.
On August 21st 1874 King Chulalongkorn issued the Royal Slave Ablation Act which was the beginning of theKing Chulalongkorn (Rama V) end for slavery in Thailand. The act allowed for children born of slaves in or after 1868, the year of his coronation, had the right to reduce their slave price every year and by the time they were 21 if they had not already bought their freedom they would be freed. The Act also fixed the price of a slave to be half as much as it was originally. All other slaves were to have their debt lowered to 1 baht a month until they had their freedom.
The act sought to prohibit children being born into slavery and slave trading in general.