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?
The House of Atreus Act I The House of Atreus Act I, released in 1999, is the ninth studio album by the American heavy metal band Virgin Steele. It has the subtitle "A Barbaric-Romantic Opera". This album is the first part of a metal opera inspired by the Oresteia, a trilogy of Greek tragedies written by Aeschylus which concerns the end of the curse on the House of Atreus. The music was intended to be the soundtrack for theatrical shows, with actors impersonating the characters of the tragedy. The metal opera was actually performed under the name "Klytaimnestra - The House Of Atreus" in European theatres from 1999 to 2001, with the production of the Memmingen Opera House company and Landestheater Production.
Olive wreath The olive wreath also known as kotinos (Greek: κότινος ), was the prize for the winner at the ancient Olympic Games. It was a branch of the wild olive tree that grew at Olympia, intertwined to form a circle or a horse-shoe. The branches of the sacred wild-olive tree near the temple of Zeus were cut by a “pais amfithalis” (a boy whose parents were both alive) with a pair of golden scissors. Then he took them to the temple of Hera and placed them on a gold-ivory table. From there, the Hellanodikai (the judges of the Olympic Games) would take them, make the wreaths and crown the winners of the Games.