Answer
Harriet Smithson is or was Hector Berlioz's spouse.
Harriet Constance Smithson, most commonly known as Harriet Smithson, who also went by Henrietta Constance Smithson, Harriet Smithson Berlioz, and Miss H.C. Smithson, was an Anglo-Irish Shakespearean actress of the 19th century, best known as the first wife and muse of Hector Berlioz.