Duke of Guastalla in the context of "Duke of Parma"

The House of Bourbon-Parma (Italian: Casa di Borbone di Parma) is an Italian cadet branch of the Spanish royal family, whose members once ruled as King of Etruria and as Duke of Parma and Piacenza, Guastalla, and Lucca. The House descended from the French Capetian dynasty in male line. Its name of Bourbon-Parma comes from the main name (Bourbon) and the other (Parma) from the title of Duke of Parma. The title was held by the Spanish Bourbons, as the founder Philip, Duke of Parma who was the great-grandson of Ranuccio II Farnese, Duke of Parma, married Louise Élisabeth of France, getting the house of Bourbon, and the state of Parma, together.The House of Bourbon-Parma is today the Sovereign House of the Grand Duchy of Luxembourg (agnatically) and all members of the Grand Ducal Family of Luxembourg are members of the House of Bourbon-Parma with the title of "Princes/Princesses" and the predicate of Royal Highness.

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. It was created by Pope Paul III (Alessandro Farnese) for his son Pier Luigi Farnese. It existed between 1545 and 1802, and again from 1814 to 1859.

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. Its territory was merged into Sardinia in 1860.

Ferrante II Gonzaga (1563 – 6 August 1630) was count and, from 1621, duke of Guastalla.

He was the son of Cesare I Gonzaga, count of Guastalla and duke of Amalfi, and Donna Camilla Borromeo. He succeeded his father in 1575. On 2 July 1621, the County of Guastalla was elevated to a duchy and Ferrante was subsequently deemed a duke.