The House of Schleswig-Holstein-Sonderburg-Glücksburg is a branch of the larger House of Schleswig-Holstein, which originated in the 16th century. This noble family has played a significant role in the history of Denmark, Norway, and Germany, with members often marrying into other royal families across Europe. The Glücksburg line began in 1863 when Christian IX of Denmark ascended to the Danish throne. The family has produced several monarchs, including the current royal family of Denmark and the former royal family of Greece. Their legacy continues to influence European royalty today.