Although The Belgian Monarchy website attributes the title of "Princess" to Queen Paola prior to marriage, Burke's Peerage 1973, The Descendants of Louis XIII 1999, Genealogisches Handbuch des Adels 2001, La Descendance de Marie-Thérèse de Habsburg 1996, and Le Petit Gotha 2002 among others, accord only the noble prefix of Donna to her and her sisters, reserving the title Principessa for the wife of the head of the family
