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Maha Vajiralongkorn Bodindradebayavarangkun or Rama X (28 July 1952 - ) has been the King of Thailand since 2016. He is the only son of Rama IX or King Bhumibol Adulyadej and Queen Sirikit. In 1972, at the age of 20, he was made crown prince by his father. After his father's death on 13 October 2016, he accepted the throne on the night of 1 December 2016.<br/><br/>

Vajiralongkorn's formal coronation took place between 4–6 May 2019. The Thai government retroactively declared his reign to have begun on 13 October 2016, upon his father's death. As the tenth monarch of the Chakri dynasty, he is also styled as Rama X. Aged 64 at that time, Vajiralongkorn became the oldest Thai monarch to ascend to the throne.
Somdet Phra Boromma-orasathirat Chao Fa Maha Vajiralongkorn Sayammakutratchakuman ("Prince Maha Vajiralongkorn, the Royal Son and Crown Prince of Siam") (born July 28, 1952) is the only son of Bhumibol Adulyadej, the King of Thailand, and Queen Sirikit. He is currently crown prince of Thailand, and the heir apparent to the throne.