roles don errico medigua , recently appointed viceroy of peru ( baritone ) senor amabile pozzo , chamberlain of peru ( tenor ) don luiz cazarro , former viceroy of peru ( bass ) count hernando verrada , a peruvian gentleman ( tenor ) scaramba , an insurgent ( baritone ) montalba , scaramba 's companion nevado , scaramba 's companion general herbana , commander of the spanish army in peru estrelda , cazarro 's daughter ( soprano ) isabel , don medigua 's daughter ( soprano ) princess marghanza , don medigua 's wife ( mezzo-soprano ) chorus of spanish and peruvian ladies and gentlemen ; soldiers , etc. synopsis don enrico medigua is the viceroy of spanish-occupied 16th-century peru and fears assassination by rebels .