Susan Seymour
From Tardis Wiki, the free Doctor Who reference
Susan Seymour was the fiancé of Richard Harries.
Biography
Susan came to observe his experiment in Banquo Manor. John Hopkinson considered her to be very beautiful and could not comprehend why she liked Harries as they were so different.
Susan called off the marriage after an argument with Richard. (EDA: The Banquo Legacy)