(Anna Charlotte) Dorothea von Medem (1761 – 1821) was born a Gräfin (Countess) of the noble German Baltic Medem family and later became Duchess of Courland (a Baltic region). Popularly known as Dorothea of Courland after her marriage to Peter von Biron, the last Duke of Courland, she hosted an aristocratic salon in Berlin and performed various diplomatic duties on behalf of her estranged husband.
"A fine mouth, a strong chin, soft green eyes, and an aquiline
nose---slightly too long, like that of all the Medems---were framed by
an oval face, set off by an abundant mass of heavy auburn hair." https://books.google.it/books…