Duchess of Brabant (by marriage)

But this was only in 1840 when it was revived as an honorific title for the Crown Prince of the newly created Kingdom of Belgium.

Historically the title went back 657 years before Belgium, and had been always associated with the wives of sovereign Dukes of Brabant, who were alive in their husband's reign.

After the death on 20 September 1085 of Hermann II, count palatine of Lotharingia, Henry III of Leuven became landgrave of Brabant, which was an imperial fief between the Dender and the Zenne and his wife, Getrude of Flanders, became Landgravine.

After the 15th century the title became one of the many appanages associated with the Queen consorts of Spain and later the Holy Roman Empresses.

Queen Sofía of Spain and also the late Crown Princess Regina of Austria also has claims to the title.