Eleonora di Garzia di Toledo

Eleonora di Garzia di Toledo or Leonor Álvarez de Toledo Osorio (March 1553 – 10 July 1576), more often known as "Leonora" or "Dianora", was the daughter of García Álvarez de Toledo, 4th Marquis of Villafranca, Duke of Fernandina. Leonora was born in Florence, where she was raised by Cosimo I de' Medici, Grand Duke of Tuscany and his wife Eleanor of Toledo, her aunt and namesake.

Betrothed to their son Pietro at the age of 15, she was mentored by Pietro's older sister, the artistic patron Isabella de' Medici, and was considered a vivacious and witty beauty. Her marriage, like Isabella's, was not a success, and she followed her mentor's example of taking lovers. For this reason, Pietro had her brought in 1576 to the country retreat of Cafaggiolo, where he strangled her to death with a dog leash. Cosimo's successor, Francesco I, tacitly approved the murder, and Pietro was never punished for it.

Until recently, little was known of Leonora di Garzia di Toledo, and she was not identified as the sitter of several portraits of her. The facts of her life have emerged from the growing scholarship on Isabella de' Medici, with whom she has much in common. In the view of art historian Gabrielle Langdon, "Her story is valuable in revealing attitudes and legalities attendant on the lives and decorum of women in the early-modern Italian court".