In Boccaccio's Decameron (iv. i), daughter of Tancred, prince of Salerno. Her father, having discovered her love for his squire Guiscardo, slew the latter and sent his heart in a golden cup to Sigismonda, who took poison and died. The father, repenting his cruelty, caused the pair to be buried in the same tomb. The story is the subject of Dryden's ‘Sigismunda and Guiscardo’, and of Robert Wilmot's Tancred and Gismund. James Thomson's Tancred and Sigismunda (1745) deals with a different story.