King Bhumibol Adulyadej was born at Mount AUburn Hospital in Cambridge , Massachusetts , USA , being the third and youngest child of HRH Prince Mahidol of Songkla and Mom Sangwan Mahidol na Ayudhya . He then returned to Thailand in 1928 , after his father obtained a certificate form Harvard. Regretfully , Prince Mahidol was to pass away a year after returning home.