In 1566 he was knighted by the second Duke of Parma, Ottavio Farnese, and made ambassador to Flanders.
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The title was held by the Torelli family in his whole history, until in 1612 it was annexed by Ranuccio I Farnese, Duke of Parma.
The Duke of Parma also usually held the title of Duke of Guastalla from 1735 (when Charles VI, Holy Roman Emperor took it from Mantua) to 1847 (when the territory was ceded to Modena), again, except for the Napoleonic dukes, when Napoleon's sister Pauline was Duchess of Guastalla and of Varella.
During the War of the Spanish Succession Alberoni laid the foundation of his political success by the services he rendered to Louis-Joseph, duc de Vendôme, commander of the French forces in Italy, to whom the duke of Parma had sent him.
At first she disliked her youthful bridegroom, but when he returned wounded from an expedition to Algiers in 1541 her aversion was turned to affection.
Pier Luigi and his son, Ottavio, declared they would have pay 9,000 golden ducati every year to the Holy See, and, in exchange, they gave back the Duchies of Camerino and Nepi.