Question:  The House of Atreus Act I, released in 1999 is the first part of a metal opera inspired by the  only extant example of an ancient Greek theatre trilogy which won first prize at what festival?
Sentence (from "Edith Hall"): In 2012 she was awarded a Humboldt Research Prize to study ancient Greek theatre in the Black Sea, and in 2014 she was elected to the Academy of Europe.
Relevant evidence: No