Answer
The answer is Lucia Ashton, the protagonist of Gaetano Donizetti's opera "Lucia di Lammermoor." Lucia portrays a tragic heroine, engaged to Edgardo but forced into an arranged marriage with Arturo Bucklaw by her brother Enrico. Her descent into madness and eventual demise form the crux of this captivating operatic tale, showcasing Sutherland's remarkable vocal prowess and dramatic intensity.