ヴォルフラム・フォン・エッシェンバッハ
The "Rätselspiel" ("mystery game") was the subsequent poetic duel between Wolfram von Eschenbach and the Hungarian sorcerer Klingsor. Wolfram proved himself capable and eloquent, and when Klingsor grew weary he summoned a demon to continue the duel. When Wolfram began to sing of the Christian mysteries, the demon was unable to respond.