Juana Pimentel
Juana Pimentel y Enriquez (c. 1404 Guadalajara –6 November 1488) was a Castilian noblewoman, and countess of Montalbán. She was known as "the sad countess".
Her husband was Álvaro de Luna, Constable of Castile.
She has been described as an example of exceptional women leaders of the mediaeval period.