Task: Text Categorization
Input (English): A character in this play adopts the name Astrea while working for a princess who assigns her the task of discovering the identity of a woman in a nobleman's locket. A soldier in this play recognizes his daughter, whom he thinks is a boy, through the sword he gave to her mother Violante. This play begins when a character traveling with Clarin in the mountains loses her horse, leading her to venture to a tower by foot. In this play Rosaura is raped by Astolfo, who makes an alliance with Estrella to succeed King Basilio as rulers of Poland. For 10 points, name this play by Pedro Calderon de la Barca about the imprisoned Prince Sigismund's realization that existence is an ephemeral illusion.20.
Output (English): Literature