Sassetta has been, for a long time, a Feud of the Republic of Pisa, at that time known as one of the main important Maritime Republics of Italy.
After the Florentine conquest, the feud of Sassetta was owned by Rinieri della Sassetta until the 1516, when, together with his brother Orlandi Della Sassetta, were exiled by Florentine Signoria.
Since the 16th century, the Feud and the Castle belonged to the family of Spanish origin, Ramirez de Montalvo who arrived in FLORENCE with the court of Eleonora da Toledo Eleonora da Toledo who married the Grand Duke of Tuscany COSIMO I Dé MEDICI.
Later in 18th century, the ownership of the land and the Castle passed to the Lorraine family.
In the year 1836 the Municipality of Sassetta was included in the province of Grosseto where it remained for several years and, most recently, to the province of Livorno.