A Thai court is holding hearings on a petition seeking to reopen one of the most controversial cases in the country's modern history, the death of King Ananda Mahidol who was found shot dead in his bedroom in 1946 at the age of 20.

King Ananda, also known as Rama VIII, reigned from 1935 to 1946, and was the uncle of the present Thai monarch Maha Vajiralongkorn and the elder brother of the last King Bhumibol Adulyadej.