Vajiravudh (วชิราวุธ, , 1 January 1881 - 26 November 1925) was the sixth monarch of Siam under the Chakri dynasty as Rama VI. He ruled from 23 October 1910 until his death in 1925. King Vajiravudh is best known for his efforts to create and promote Siamese nationalism. His reign was characterized by Siam's movement further towards democracy and minimal participation in World War I. He had keen interests in Siamese history, archaeology, and literature, as well as economics, politics and world affairs, and founded the country's first university, Chulalongkorn University.
Vajiravudh was born on 1 January 1881 to Chulalongkorn and one of his four queens and half sister Saovabha Phongsri. In 1888, upon coming of age, Vajiravudh received the title Krom Khun Thep Dvaravati (Prince of Ayutthaya).
Prince Vajiravudh was first educated in the royal palace in Thai and English. His full siblings were Bahurada Manimaya, Tribejrutama Dhamrong, Chakrabongse Bhuvanath, Siriraj Kakudhabhand, Asdang Dejavudh, Chudadhuj Dharadilok and Prajadhipok, who succeeded him as King Rama VII. In 1895, his half-brother Crown Prince Vajirunhis died and Vajiravudh was appointed the new Crown Prince of Siam. In 1898, he continued his education in Britain at the Royal Military College, Sandhurst and was commissioned as a captain in the Durham Light Infantry, which he served with for three months of exercises in the south of England upon graduation. He studied law and history at Christ Church, Oxford in 1899, where, coming from a royal household, he was a member of the exclusive Bullingdon Club. However, he suffered from appendicitis, which barred him from graduating in 1901. He visited other European countries while he lived in England, including Belgium where he inspected Blegny fort. He went to Berlin, Germany in May 1902 and Copenhagen, Denmark in September 1902. He attended the 15 May 1902 enthronement ceremonies for King Alfonso XIII of Spain in Madrid. On behalf of his father, King Chulalongkorn, he attended the coronation of King Edward VII on 9 August 1902.