As the opera opens the Nubian King Agorante, who is infatuated with Zoraide, has defeated her father, Ircano and captured her. Ricciardo, a Christian knight, and Zoraide's lover accompanies an emissary to plead for her release. Agorante's jealous wife, Zomira, arranges the capture of Ricciardo as well and plots to have the young lovers executed to protect her position as Queen. The opera ends with an army of Christian knights rescuing Ricciardo and Zoraide. Ricciardo spares Agorante's life.
Michael Steen, Richard Osborne, The Lives and Times of the Great Composers: His Life and Works, Oxford University Press, 2007, pp. 271-278. ISBN 0195181298