Vajiralongkorn (Thai: วชิราลงกรณ; RTGS: Wachiralongkon, pronounced [wá.tɕʰí.rāː.lōŋ.kɔ̄ːn]; born 28 July 1952) is King of Thailand. He is the only son of 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 was expected to ascend to the throne of Thailand but asked for time to mourn before taking the throne.[4] He accepted the throne on the night of 1 December 2016. His coronation took place from 4–6 May 2019.[5] The Thai government retroactively declared his reign to have begun on 13 October 2016, upon his father's death.[6] 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.