Bhumibol Adulyadej (born 5 December 1927 – 13 October 2016), conferred with the title King Bhumibol the Great in 1987 (officially conferred by King Vajiralongkorn in 2019), was the ninth monarch of Thailand from the Chakri dynasty, titled Rama IX. Reigning since 9 June 1946, he was the world’s longest-reigning current head of state from the death of Emperor Hirohito of Japan in 1989 until his own death in 2016, and is both the second-longest reigning monarch of all time and the longest-reigning monarch to have reigned only as an adult, reigning for 70 years and 126 days. During his reign, he was served by a total of 30 prime ministers beginning with Pridi Banomyong and ending with Prayut Chan-o-cha.
Forbes estimated Bhumibol’s fortune – including property and investments managed by the Crown Property Bureau, a body that is neither private nor government-owned (assets managed by the Bureau were owned by the crown as an institution, not by the monarch as an individual) – to be US$30 billion in 2010, and he headed the magazine’s list of the “world’s richest royals” from 2008 to 2013 although the same magazine also estimated the worth of the British monarchy triple that of the Thai. In May 2014, Bhumibol’s wealth was again listed as US$30 billion.