Eleonora degli Albizzi (1543 – 19 March 1634) was a mistress of Cosimo I de' Medici, the Grand Duke of Tuscany.
Tradition holds that his long-time chamberlain Sforza Almeni of Perugia shared the Duke's desires with Francesco I, the legitimate heir who was increasingly the dominant force in the government.
[1][2][3] This event, along with others episodes such as the rumored murder of Filippo Strozzi the Younger, reinforced a perception that Cosimo was possessed of an excessively passionate, if not bloodthirsty, ruthlessness.
In 1567 she was forced to marry the dishonored nobleman Carlo Panciatichi, who had faced execution for rebellion; he was pardoned and granted a compensation of 10 thousand scudi to take Eleonora.
It is unclear what role his legitimate children played in arranging to remove Albizzi from the Grand Duke's orbit.