Question: What three act opera by German composer Richard Wagner did Uwe Eric Laufenberg direct at the Bayreuth Festival?
Sentence (from "Parsifal"): It is loosely based on "Parzival" by Wolfram von Eschenbach, a 13th-century epic poem of the Arthurian knight Parzival (Percival) and his quest for the Holy Grail (12th century).
Relevant evidence: No