E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The fiend-father of Robert le Diable. After alluring his son to gamble away all his possessions, he meets him near the rocks St. Irene, and Helena seduces him in the Dance of Love. When Bertramo at last comes to claim his victim, he is resisted by Alice, the foster-sister of the duke, who reads to him his mothers will, and angels come to celebrate the triumph of good over evil. (Meyerbeers opera of Roberto il Diavolo.)