Descendants of Prince Felix and also members of the Grand Ducal Family of Luxembourg (see there): Princess Joan Descendants of Prince René: Princess Maria Pia Princess Marina Descendants of Prince Louis: Prince RémyPrincess Elisabeth Princess Chantal Prince JeanPrincess Virginia The Duke of Parma and Piacenza (Italian: duca di Parma e Piacenza) was the ruler of the Duchy of Parma and Piacenza, a historical state of Northern Italy.

The Duke of Parma was also Duke of Piacenza, except for the first years of the rule of Ottavio Farnese (1549–1556), and the time of the Napoleonic wars, when the two were established as separate positions held by two different individuals.

The Duke of Parma also usually held the title of Duke of Guastalla from 1746 (when Francis I, Holy Roman Emperor occupied the Duchy of Guastalla after the last Gonzaga duke died childless) until 1847 (when the territory was ceded to Modena), except for the Napoleonic era, when Napoleon's sister Pauline was briefly Duchess of Guastalla and of Varella.

The last duke, Robert I, was driven from power in a revolution following France and Sardinia's victory over Austria.

These did not actually rule over any territory of Parma and Piacenza, but were of the honorary, hereditary type duché grand-fief, granted by Napoleon I in 1808.