German singer, who became famous through his part of Siegfried in Wagner's Der Ring des Nibelungen. He was born in Leipsic, where he studied theology as well as music. He was thirty-seven years old when he made his debut as a singer. After this he sang at Cassel, Zurich, Bremen, Neus trelitz, Brünn, Elberfeld and Mannheim. Hans Richter recommended him to Wagner for the role of Siegfried. Unger sang the part very successfully at Bayreuth in 1876 and elsewhere. He sang in Leipsic from 1877 to 1881.