The Duke of Geldern was a noble title associated with the region of Geldern, located in present-day Germany and the Netherlands. The title emerged in the late Middle Ages and was held by various rulers who governed the area, which was strategically important due to its location along trade routes. The dukedom was part of the larger political landscape of the Holy Roman Empire. Throughout its history, the title was contested by various powers, including the Duchy of Cleves and the Duchy of Brabant. The dukedom eventually became part of the Duchy of Cleves in the 16th century, leading to its integration into the broader political entities of the region.