Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (died 1689)

Ernest Günther I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg

Duke of Schleswig-Holstein-Sonderburg-Augustenburg

Ernest Günther I of Schleswig-Holstein-Sonderburg-Augustenburg was a Duke of Schleswig-Holstein of its Sonderburg line. He was the first to have his ducal seat in Augustenborg Palace, which he built and named in honor of his wife. He ruled from 1647 until his death in 1689.