Infortunio is in love with Selina — but she is set to marry the elderly Rufaldo. The frustrated Infortunio loses his sanity, and wanders through the countryside. Selina, however, discovers that she does love Infortunio — but only on the eve of her wedding day. She disguises herself as a shepherd and runs away to the forest. Antonio, her brother, pretends to search for her; but he actually disguises himself in her wedding gown and takes her place in the wedding ceremony. His motive for this strange act? — Antonio is in love with Hilaria, Rufaldo's daughter; but Rufaldo wants Hilaria to marry the wealthy fool Bubulcus. Antonio-as-Selina knocks down "her husband" Rufaldo, and ridicules and humiliates him in public. Bubulcus pretends to have slain Antonio in a duel; he is arrested for this, since Antonio has disappeared (at least to the other characters, who cannot penetrate his disguise) and is believed dead.