Der Ring des Polykrates (The Ring of Polykrates), Op. 7 is a one-act opera by Erich Wolfgang Korngold. The libretto, written by Leo Feld and reworked (unattributed) by the composer's father Julius Korngold, is based on a drama by Heinrich Teweles.
Korngold composed the opera (his first) in 1914, when he was only seventeen years old. The one-act domestic comedy was contrasted by his second opera Violanta, a one-act tragedy. Both were premiered together on 28 March 1916 at the National Theatre Munich. Bruno Walter conducted and the cast included Karl Erb and Maria Ivogün. Both operas were repeated in Vienna, with Selma Kurz and Alfred Piccaver in Polykrates and Maria Jeritza as Violanta. In November 1916, it was given at the Dresden Hofoper, with Richard Tauber and Elisabeth Rethberg in the leading roles.
The librettist Leo Feld placed the story in the 18th century, when Friedrich Schiller's ballade of the same title was new.
The musician Wilhelm Arndt seems to have everything going for him: he is happily married to Laura, he has been appointed Hoffkapellmeister and he has just inherited a small fortune. Only the return of his long-lost friend Peter Vogel could make him even more happy. When Vogel actually returns, he is jealous of Wilhelm's happiness, and convinces him that in order not to challenge fate, he should sacrifice something (after the example set in Schiller's ballade Der Ring des Polykrates). Wilhelm starts an argument with his wife about her former life, but the couple's love is strong enough to overcome all difficulties. In the end, all agree that the sacrifice that has to be offered is the intriguer that tried to ruin their happiness: Peter Vogel has to leave again.