In one of the tribes of the Algerian Sahara, everyone awaits the arrival of the hero who will defend the rights of the poor. A man decides one day to put the mark of the "hero" on his newborn son and the whole tribe celebrates the arrival of this eagerly awaited messiah who came to save them. This false hero then grows up by assuming his role of savior. Filled with cynicism, he crosses the countryside and has a number of adventures.

After saving an infant of royal blood, knight Brancaleone forms a new army and sets out to return the baby to his father: a prince fighting in the Crusades.