These fiefs evolved into truly independent states: the Landi governed the higher Taro's valley from 1257 to 1682. The Pallavicino seignory extended over the eastern part of today's province, with the capital in Busseto. Parma's territories were an exception for Northern Italy, as its feudal subdivision frequently continued until more recent years. For example, Solignano was a Pallavicino family possession until 1805, and San Secondo belonged to the Rossi well into the 19th century.
Between the 14th and the 15th centuries, Parma was at the centre of the Italian Wars. The Battle of Fornovo was fought in its territory. The French held the city in 1500–1521, with a short Papal parenthesis in 1512–1515. After the foreigners were expelled, Parma belonged to the Papal States until 1545.
In that year the Farnese pope, Paul III, detached Parma and Piacenza from the Papal States and gave them as a duchy for his illegitimate son, Pier Luigi Farnese, whose descendants ruled in Parma until 1731, when Antonio Farnese (1679–1731), last male of the Farnese line, died. In the Treaty of London (1718) it was promulgated that the heir to the duchy would be Elisabeth Farnese's elder son with Philip V of Spain, Don Carlos. In 1731, the fifteen-year-old Don Carlos became Charles I Duke of Parma and Piacenza, at the death of his childless great uncle Antonio Farnese. In 1734, Charles I conquered the kingdoms of Naples and Sicily, and was crowned as the King of Naples and Sicily on 3 July 1735, leaving the Duchy of Parma to his brother Philip (Filippo I di Borbone-Parma).
View of Palazzo della Pilotta in the Piazza della Pace. The rebuilt part on the right is where once was the church of St.Peter. The large hole was caused by an Allies bombing.
In 1594 a constitution was promulgated, the University enhanced and the Nobles' College founded. The war to reduce the barons' power continued for several years: in 1612 Barbara Sanseverino was executed in the
