The House of Sayn-Hachenburg was a noble family in Germany that emerged in the late Middle Ages. It was a branch of the larger House of Sayn, which played a significant role in the region's history. The family held various territories and titles, primarily in the Rhineland and Westphalia. The Sayn-Hachenburg lineage is known for its connections to other noble houses through marriage and alliances. Their influence waned over time, and the family eventually became part of the House of Sayn-Wittgenstein in the 17th century. Today, their historical significance is recognized in the context of German nobility.