Who is Marchese Borghi from Eleven Short Stories = Undici Novelle and what is their importance?

Marchese Borghi is the mother of the Marchese Borghi and the employer of Lydia Venturi. The Marchesa spares no expense in trying to find a doctor who might cure her blind son, but dies suddenly after the visit by Dr. Falci, never knowing that he was able to cure him.