E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Princess of Sicily, in love with Robert le Diable, but promised in marriage to the prince of Granada, who challenged Robert to mortal combat. Robert was allured from the combat by his fiend-father, but when Alice told him that Isabella the princess is waiting for him at the altar, a struggle took place between Bertram and Alice, the one trying to drag the duke to the infernal regions, and the other trying to win him to the ways of virtue. Alice prevailed, but the audience is not informed whether Robert married Isabella or not. (Meycrbeers opera, Robert il Diavolo.)
Isabella, daughter of Hercules, Duke of Ferrarë, sister of Alfonso and Ippolito, and wife of Francisco Gonzago, lord of Mantua.