Chulalongkorn Day is a national holiday in Thailand commemorating King Chulalongkorn 
(Rama V), the king who abolished slavery and introduced numerous reforms when the 
country was still called Siam. 
He succeeded to the throne in 1868 when he was 15 years old, was crowned in 1873, 
and ruled until his death in 1910. He had been a pupil of Anna Leonowens, who taught 
the young prince about Abraham Lincoln. 
The story of her stay in the royal court, and her teaching of the royal children and 
concubines, was told in Margaret Landon's book, Anna and the King of Siam . 
The book was the basis for the popular Broadway musical, The King and I .
More info...
https://encyclopedia2.thefreedictionary.com/Chulalongkorn+Day
 
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