The House of Schleswig-Holstein-Sonderburg is a branch of the larger House of Schleswig-Holstein, which originated in the 12th century. This noble family played a significant role in the history of Denmark and Germany, particularly during the period of the {Danish monarchy} and the {German Confederation}. The family is known for its various territorial claims and alliances through marriage. Members of the House of Schleswig-Holstein-Sonderburg held titles and lands in regions such as {Schleswig} and {Holstein}. The family contributed to the political landscape of Northern Europe, influencing events like the {Danish-German Wars}. Today, their legacy is reflected in historical studies and the preservation of their ancestral estates.