From The Telegraph:
Archduchess Regina von Habsburg, who died on February 3 aged 85, was the wife of Dr Otto von Habsburg – formerly Crown Prince of the Austro-Hungarian Empire and latterly a highly respected member of the European parliament; had history taken a different turn, she would have been Empress of Austria and Queen of Hungary.
Dr. von Habsburg befriended Ludwig von Mises, who served as his political and economic advisor. (Thanks to Matthew Robare.)3:49 pm on February 5, 2010 Email Llewellyn H. Rockwell, Jr.