The House of Gelre was a noble family that ruled the region of Gelre in the Low Countries during the late Middle Ages. It emerged in the 11th century and played a significant role in the political landscape of the area, particularly in the Duchy of Gelre. The family was known for its influence and power, often engaging in conflicts with neighboring territories. The most notable member of the House of Gelre was Duke Arnold of Gelre, who reigned in the 15th century. Under his leadership, the duchy experienced both military successes and territorial disputes, particularly with the Duchy of Brabant and the County of Holland. The House of Gelre eventually declined in power, leading to its integration into the Habsburg territories.