Guglielmo de' Rossi

Guglielmo de' Rossi (c. 1252–1339) was the Guelph soldier of Parma who spent half his life fighting to get back into the city. Son of Giacomo de' Rossi, he married Donella da Carrara of Padua in 1282, served as podestà of Modena, Milan and Lucca, and in 1293 drove the Sanvitale out of Parma.

After Giberto III da Correggio seized Parma in 1303, Guglielmo was repeatedly exiled. He routed Giberto's Ghibellines in 1308 before losing at Torrechiara, and when Giberto switched to the Guelphs without readmitting the exiles, united discontented exiles to take Borgo San Donnino. After Emperor Henry VII died he sought peace, and married his daughter Maddalena to Giberto.

In 1336 Mastino II della Scala's takeover of Parma drove him into exile again, and he died at the Carrara court in Padua in 1339.