The House of Oldenburg is a European royal family that originated in the 12th century in the region of Oldenburg, Germany. It has produced several monarchs and has connections to various royal houses across Europe, including the House of Schleswig-Holstein and the House of Denmark. Members of the House have ruled over several territories, including Denmark, Norway, and Sweden. The family is known for its significant influence in European history, particularly during the Middle Ages and the Renaissance, and continues to play a role in modern European monarchies.