King Bhumibol Adulyadej of Thailand holding a baby in a crib.- 1962Bhumibol Adulyadej (Thai: Phumiphon Adunyadet, born 5 December 1927) is the King of Thailand. He is also known as Rama IX, as he is the ninth monarch of the Chakri Dynasty. Having reigned since 9 June 1946, he is the world's longest-serving current head of state and the longest-reigning monarch in Thai history, serving for 70 years, 38 days.