The House of Sayn-Altenkirchen is a noble family from the region of Germany. It originated in the 12th century and is a branch of the larger House of Sayn. The family played a significant role in the political landscape of the area, particularly during the Middle Ages. Members of the House of Sayn-Altenkirchen held various titles and lands, contributing to the development of local governance. The family is known for its historical connections to other noble houses and its influence in the Rhineland region. Today, the family's legacy continues to be of interest to historians and genealogists.