Orlando finto pazzo  Orlando finto pazzo (; "Orlando, the Fake Madman") is an opera ("dramma per musica") in three acts composed by Antonio Vivaldi to a libretto by Grazio Braccioli. The plot is based on an episode in Matteo Boiardo's unfinished epic poem "Orlando Innamorato" (). The second of Vivaldi's known operas, "Orlando finto pazzo" premiered in November 1714 (dedication 10 November) at the Teatro Sant'Angelo in Venice. Vivaldi acted as impresario (in partnership with his father Giovanni Battista) as well as composer. Apparently the opera did not meet much approval from the audience and was billed only on few dates, just to be replaced, on 1 December, by a reworking of Giovanni Alberto Ristori’s "Orlando furioso" (), an opera that the Vivaldi ""impresa"" had very successfully staged in 1713. "Orlando finto pazzo" is listed as RV 727 in the Vivaldi catalogue. Ersilla dedicates a sword to the destruction of Orlando, and entrusts the sword and mission to Argillano, who secretly loves her. Ersilla’s enemies, Brandimarte, Grifone and Origille spy on the rituals. As the ceremony ends, Tigrinda, priestess of potions, tries unsuccessfully to tell Argillano she loves him. Grifone follows Tigrinda, who he in turn secretly loves. Argillano challenges Grifone, who is protected by Origille – she pretends that he is her young sister, “Leodilla.” Origille, who is pledged to Grifone, challenges his obvious love for Tigrinda, then vows her revenge. Orlando defeats but spares Argillano, leaving the magic sword on the ground as he severs the golden branch, thus opening the way for everyone into Ersilla’s garden. Ersilla notices the sword, and infers Argillano’s defeat. As her fairies bewitch Orlando with their songs, Ersilla becomes smitten with Brandimarte, who uses this to rescue Orlando. Grifone tries to capitalise on his reluctant disguise to get closer to Tigrinda by becoming her handmaiden. Origille, now disguised as a man, “Ordauro,” interrupts them.