Mongkut succeeded by Rama V, who became known as Chulalongkorn ("the white elephant lord"), and that was one of the most popular and enlightened by all the kings during Chakridy-nastin. During his 42 reign he abolished slavery and created a new school system, established the first post office, and founded a state library.
Mongkut nagtagumpay sa pamamagitan ng Rama V, na naging kilala bilang Chulalongkorn ("ang puting elepante lord"), at iyon ay isa sa mga pinaka-popular at napaliwanagan sa pamamagitan ng lahat ng mga hari sa panahon Chakridy-nastin. Sa panahon ng kanyang 42 paghahari inalis niya ang pang-aalipin at lumikha ng isang bagong sistema ng paaralan, itinatag ang unang post office, at itinatag ng isang estado library.