The warring parties of the city of Syracuse join forces to fight together against the approaching Saracen. This covenant shall be sealed by a marriage between Amenaide, the daughter of the chief town, with the erstwhile opponents Orbazzanos form an alliance. However, your love belongs Tancredi, on the death penalty is imposed as an alleged enemy of the people. An intercepted letter causes also Amenaide is deemed a traitor: She has reportedly promised the leader of the Saracens. Your protestations of innocence is not believed. Tancredi saves Although a God's judgment of death, but without their innocence to be convinced. From their supposed infidelity deeply hurt he goes to war against the Saracens, where he seeks death.
The contract to opera seria meant for the young Rossini, who came forward to this time as a composer of short humorous works, a great career opportunity. Musically, he is aware of the tradition of opera seria of the 18th century standing, rooted in this work but some new features that are his "trademark" and characterize the opera of the early 19th century term. With Tancredi, the young composer took the European theater world. Noteworthy are the rich instrumentation and the soloistic treatment of individual instruments and instrumental groups. The melody has in Rossini operas priority and a phenomenon that occurs Tancredi is the strong cooperation of vocal and instrumental virtuosity.