Duchy of Parma and Piacenza

The Duchy of Parma and Piacenza (Italian: Ducato di Parma e Piacenza, Latin: Ducatus Parmae et Placentiae) was an Italian state created in 1545 and located in northern Italy, in the current region of Emilia-Romagna. Originally a realm of the Farnese family after Pope Paul III made it a hereditary duchy for his son, Pier Luigi Farnese, it was ruled by the dynasty until 1731, when the last duke, Antonio Farnese, died without direct heirs.

Source: Wikipedia — Duchy of Parma and Piacenza (CC BY-SA 4.0)