High Quality Content by WIKIPEDIA articles! Wan Waithayakon (full title: His Royal Highness Prince Vanna Vaidhayakara, the Prince Naradhip Bhongseprabhan), known in the West as Wan Waithayakon (1891-1976), was a Thai diplomat. He was elected President of the Eleventh Session of the United Nations General Assembly, while serving as Thailand`s Permanent Representative to the United Nations. He was a grandson of King Mongkut.