The 35-year-old fifth Druk Gyalpo or Dragon King, who studied international relations at Magdalen College, Oxford, is a pin-up in the Far East. He was nicknamed Prince Charming in Thailand on a visit in 2006 and added to his army of female fans in Japan in 2011. The couple are fluent in English.
Bhutan, the size of Denmark but with a population of 750,000, is landlocked between India and China.
William and Kate have much to learn about its history and etiquette. Bhutan was isolated for centuries, shunning foreign influences.
It is bad manners to say yes when food is offered although accepting after two or three offers is fine.
They are also likely to spot a racy custom in the otherwise conservative Buddhist land: giant phalluses are often painted on homes to ward off evil spirits.
The Duke and Duchess added their visit to Bhutan, at the request of the Government, to a trip to India.