King Bhumibol the Great in 1987,[1][2][3][4] was the ninth monarch of Thailand from the Chakri Dynasty as Rama IX. Having reigned since 9 June 1946, he was, at the time of his death, the world's longest-serving head of state[5] and the longest-reigning monarch in Thai history, serving for 70 years, 126 days.[6] During his reign, he was served by a total of 30 prime ministers beginning with Pridi Banomyong and ending with Prayut Chan-o-cha.[7]