Located in Petchaburi province some 120km south of Bangkok, spread across three mountain peaks, is the southern palace retreat of King Mongkut (Rama IV). Officially called Phra Nakhorn Khiri, the "Celestial Mountain-top City" it is more commonly called Wang Khao or "Hill-top Palace".
On 23rd October 1910 King Chulalongkorn (Rama V) at the age of 57 died. He had reigned over Siam for 42 remarkable years. His death was mourned throughout the nation and was reported around the world. The day is still remembered as an annual holiday in Thailand. But what exactly did he die of ?