The Duke of Brabant reference article from the English Wikipedia on 24-Apr-2004
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Duke of Brabant

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The title Duke of Brabant was created when the counts of Leuven acquired the duchy of Lower Lorraine after the death of Godfrey of Bouillon. As the importance of Lower Lorraine fell, the counts of Leuven started to name themselves after Brabant, the region in which Leuven is located.

Table of contents
1 House of Louvain
2 House of Valois
3 House of Habsburg

House of Louvain

House of Valois

House of Habsburg

In modern times, the title Duke of Brabant is held by the crown prince of Belgium.