Jigme Singye Wangchuck

Born 11 November 1955, the only son among five children of King Jigme Dorji Wangchuck, he studied in Darjeeling and Sussex before being named Trongsa Penlop at sixteen. When his father died in Kenya on 21 July 1972, the teenage crown prince became the world's youngest reigning monarch three days later; his coronation followed in June 1974. He began dismantling his own absolute authority almost immediately, establishing local councils in 1981 and 1991 to push governance down to village level, then forming a Constitution Drafting Committee by royal decree in 2001. He introduced the Gross National Happiness philosophy in the early 1970s, prioritizing holistic development over GDP, and in 2003 personally led troops in Operation All Clear to expel insurgents from the south. After shepherding the constitution through every district and watching it take effect in July 2008, he abdicated in 2006 - thirty-four years in, job done - and handed power to his son Jigme Khesar Namgyal Wangchuck.