 In 1439, with the marriage of Cecilia Aldobrandeschi and Bosio Sforza, the castello and its town passed to the Sforza.The Sforza of Santa Fiora reached their highest point of power with count Guido Sforza di Santa Fiora, who managed to establish himself as a relative of Pope Paul III Farnese, thereby gaining prestigious political positions for his relatives.Later the family became the Sforza Cesarini, who are still well represented and living in their Roman Palazzo Sforza Cesarini.