Thai King Bhumibol Adulyadej (C), accompanied by Crown Prince Maha Vajiralongkorn (L) and Queen Sirikit, attends the Trooping of the Colour, an annual military parade, in Bangkok's Royal Plaza December 2, 2008. The Thai King, the world's longest reigning monarch, will turn 81 years old on December 5. Reuters Pictures 12 months ago

Thai King Bhumibol Adulyadej (C), accompanied by Crown Prince Maha Vajiralongkorn (L) and Queen Sirikit, attends the Trooping of the Colour, an annual military parade, in Bangkok's Royal Plaza December 2, 2008. The Thai King, the world's longest reigning monarch, will turn 81 years old on December 5.