Adelaide of Holstein-Rendsburg (died January 1350), Countess of Schauenburg, was the daughter of Count Henry I and his wife, Helwig of Bronckhorst. One source gives her birthdate as 1299 in Rendsburg, Rendsburg-Eckernforde, Schleswig-Holstein, Germany.In 1313, Adelaide married Duke Eric II of Schleswig (1288-1325). They had two children: Valdemar III (1314–1364), King of Denmark 1326–1329, Duke of Schleswig as Valdemar V 1325–1326 and 1330–1364. Helvig of Schleswig (d.