Set during the Crusades, the story of Lombardi opens with the rivalry of two brothers -- Arvino and Pagano -- who vie with one another for the love of Viclinda. Pagano attempts to kidnap Viclinda and commit a fratricide, extinguishing Arvino, but succeeds only in murdering his father in error; circumstances force him into exile in the Holy Land. Thus begins a complex and harrowing series of events that will ultimately lead to the reconciliation of both men, followed by the death of one.