His Majesty King Prajadhipok was very interested in Singapore, especially the British military force here. The King paid a visit to Singapore when on his way to Java in order to see the Royal Naval Base in Sembawang. It was in his reign that Siam became a constitutional monarchy in 1932. King Prajadhipok went to England in 1934 and spent the last years of his life there. In 1949, Field Marshal Por Pibun Songkhram, the Prime Minister of Thailand, asked Queen Rambhaibarni to bring the ashes of King Rama VII back to Thailand. The Queen stopped over in Singapore on her way back to Thailand.

Apart from the visit to Singapore by King Rama VII, many members of the royal family visited Singapore, such as Prince Chandaburi Nareunath and Prince Julachakrabongsa.