1‐act opera by R. Strauss to lib. by J. Gregor (from an idea and with emendations by S. Zweig) based on Calderón's play La Rendición de Breda (1625). Comp. 1935–6. Prod. Munich 1938. F. Amer. p. Los Angeles (Univ. of S. Calif., in English), 1957; NY (concert) 1989. F. Eng. p. BBC broadcast (concert perf.) 1971; public concert perf. London 1985.