Vajiralongkorn (; , ; 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. He accepted the throne on the night of 1 December 2016. His coronation took place from 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. He is the wealthiest monarch in the world, with a net worth estimated to be between and . Early life and education Vajiralongkorn was born on 28 July 1952 at 17:45 in the Amphorn Sathan Residential Hall of the Dusit Palace in Bangkok. When the crown prince was one year old, Somdet Phra Sangkharat Chao Kromma Luang Vajirananavongs, the 13th Supreme Patriarch of Thailand of the Rattanakosin Era, gave the child his first name at birth, Vajiralongkorn Boromchakrayadisorn Santatiwong Thewetthamrongsuboribal Abhikkunupakornmahitaladulyadej Bhumibolnaretwarangkun Kittisirisombunsawangwat Boromkhattiyarajakumarn. Vajiralongkorn began his education in 1956 when he entered kindergarten at the Chitralada School in Dusit Palace. After completing Mathayom 1 (grade seven), he was sent to be educated at private schools in the United Kingdom, first at a prep school, King's Mead, Seaford, Sussex, and then at Millfield School, in Somerset, where he completed his secondary education in July 1970. In August 1970, he attended a five-week military training course at The King's School, in Sydney, Australia. In 1972, the prince enrolled at the Royal Military College, Duntroon in Canberra, Australia. His education at Duntroon was divided into two parts, military training by the Australian Army and a bachelor's degree course under the auspices of the University of New South Wales. He graduated in 1976 as a new lieutenant with a liberal arts degree. In 1982, he completed a second bachelor's degree in law, with second-class honors at Sukhothai Thammathirat Open University. Heir apparent and social interest Vajiralongkorn was proclaimed crown prince on 28 December 1972 at 12:23 in the Ananta Samakhom Throne Hall, making him the third crown prince