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The year 1851 was the 70th year of the Rattanakosin Kingdom of Siam (now known as Thailand). It was the 28th and last year in the reign of King Nangklao (Rama III), and the first year in the reign of King Mongkut (Rama IV).
May 15 - King Rama IV (Mongkut) is crowned, and takes as his wife Somanass Waddhanawathy. This is the first time foreigners have been invited to a coronation ceremony in Siam. The ceremony, which had previously been held according to Hindu rites, also incorporates the recitation of the Buddhist "Paritta Suttas".[1]
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