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Jaquino is Rocco's love-struck assistant. He is besotted in his love for Marzelline, Rocco's daughter, and proposes marriage to her. However, Marzelline is in love with Fidelio, unaware that Fidelio is in fact Leonore disguised as a man, whose mission is to free her husband, Florestan. It wouldn't be opera without a bit of love-struck confusion now would it?