He was the first son of King Chulalongkorn and Queen Savang Vadhana together, who were half-siblings.

On 14 January 1886, he was officially introduced to his position with the title of Sayam Makutrajakuman, or Crown Prince of Siam.

From this appointment Sir Ernest Mason Satow, the British ambassador to Thailand, brought a telegraph of congratulations from Queen Victoria of the United Kingdom.

[1] Prince Vajirunhis was interested in the liberal arts, writing daily in a diary he was given by his father at the age of five.

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