Question: What was the nationality of the author of the outline that Die Liebe der Danae is based on?
Sentence (from "Die Liebe der Danae"): Die Liebe der Danae ("The Love of Danae") is an opera in three acts by Richard Strauss to a February 1937 German libretto by Joseph Gregor, based on an outline written in 1920, "Danae, or The Marriage of Convenience", by Hugo von Hofmannsthal.
Relevant evidence: Yes