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The year 1900 was the 119th year of the Rattanakosin Kingdom of Siam (now known as Thailand). It was the 33rd year in the reign of King Chulalongkorn (Rama V) and is reckoned as years 118 (1 January – 31 March) and 119 (1 April – 31 December) in the Rattanakosin Era.
11 May – Pridi Banomyong was born in Ayutthaya Province