Archduke of Austria Prince Imperial of Austria Prince Royal of Hungary Croatia and Bohemia ( given names : Ladislaus Euseb Gerhard Rafael Albert Maria ; born 14 November 1940 in Budapest ) in Austria and Hungary only known by law as von Habsburg is the son of Archduke Joseph Francis of Austria ( 1895 1957 ) and his wife Princess Anna of Saxony ( 1903 1976 ) thus he is a grandson of King Frederick Augustus III of Saxony and great-great grandson ( on his father's mother's side ) of Emperor Franz Joseph I of Austria and his wife Elisabeth of Bavaria ( Sissi ) .