Cornelius (1824-1874) was a German composer. From an early age he played the violin and composed, eventually studying with Tekla Griebel-Wandall and composition with Heinrich Esser in 1841. He lived with his painter uncle Peter von Cornelius in Berlin from 1844 to 1852, and during this time he met prominent figures such as Alexander von Humboldt, the Brothers Grimm, Friedrich Rückert and Felix Mendelssohn. Cornelius's first mature works (including the opera Der Barbier von Bagdad) were composed during his brief stay in Weimar (1852–1858). His next place of residence was Vienna, where he lived for five years. It was in Vienna that Cornelius began a friendship with Richard Wagner. At the latter's behest, Cornelius moved to Munich in 1864, where he married and fathered four children. During his last few years in Berlin, Cornelius wrote music criticism for several major Berlin journals and entered into friendships with Joseph von Eichendorff, Paul Heyse and Hans von Bülow.