The House of Geldern was a noble family that originated in the region of Geldern, which is now part of modern-day Germany and Netherlands. This family played a significant role in the politics of the Low Countries during the late Middle Ages and the early Renaissance. They were known for their territorial claims and alliances, which influenced the power dynamics in the region. The house was established in the 12th century and became prominent through strategic marriages and military engagements. Members of the House of Geldern held various titles, including dukes and counts, and were involved in conflicts such as the Duke of Geldern's War. Their legacy is reflected in the history of Nijmegen and surrounding areas.