Vajiralongkorn (born 28 July 1952), also known by his regnal name Rama X, is King of Thailand. He is the tenth monarch of the Chakri dynasty, the reigning dynasty of Thailand since 1782.
The only son of King Bhumibol Adulyadej (Rama IX) and Queen Sirikit, he was made crown prince by his father in 1972, at the age of 20. After his father's death on 13 October 2016, he requested that his formal accession ceremony be delayed to allow for time to mourn his father. On 1 December 2016, he formally accepted the throne, becoming the tenth Thai monarch of the Chakri dynasty and, at the age of 64, the oldest to ascend to the throne. The government retroactively declared his reign to have begun at his father's death on 13 October 2016. His coronation took place from 4 to 6 May 2019.
