The Duke of Brabant was a historical title in the region of Brabant, which is now part of modern-day Belgium and the Netherlands. The title emerged in the 12th century and was held by various noble families, most notably the House of Reginar and later the House of Habsburg. The Duke of Brabant played a significant role in the political landscape of medieval Europe, often engaging in alliances and conflicts with neighboring territories. Brabant was an important center for trade and culture during the Middle Ages, contributing to the prosperity of the region. The title of Duke of Brabant eventually became part of the larger title of the Duke of Brabant and Limburg, reflecting the union of these territories. The title ceased to be used in the 18th century, but its historical significance remains in the cultural heritage of Belgium and the Netherlands.