"Emilia di Liverpool" is an opera by which of these composers?

Though many 19th century composers turned to the works of Walter Scott and the history of the British monarchy for their inspiration, it is perhaps a little surprising to discover a work that is, ostensibly, set in Liverpool! Or at least in the "mountains near Liverpool" (whether he had in mind the Welsh mountains or the Lake District fells or neither, is open to debate).

The plot concerns the titular heroine, who, after being seduced and abandoned by Federico, has dedicated herself to good works in pious obscurity. She is the daughter of Claudio, Count of Liverpool. Burke's Peerage would probably not recognise this title!

In the end, her erring suitor returns, assuring her that he is reformed, but her father challenges him to a duel. Another admirer of hers, the noble Don Romualdo (whose proposal she turned down whilst courting Federico) intervenes to stop the duel. But in time-honoured operatic tradition, it is still the tenor (Federico) who gets the girl.

The work was performed a few times in the 1820s and 1830s, revived briefly in 1871, and then had to wait until 1957 for subsequent recognition when the legendary Joan Sutherland played the title role in a BBC radio version.