da Correggio
The da Correggio were a noble house of Emilia, named after Correggio castle near Reggio, where Frogerio is recorded as lord in 1009. They built up fiefs between Parma and Reggio.
Giberto III became lord of Parma in 1303 and briefly mastered Cremona and Guastalla. Named imperial vicar of Reggio by Henry VII, he switched from the Ghibellines to the Guelphs and was driven out of Parma in 1316. His sons retook Parma in 1341 but sold it to the Este in 1344, after which the house concentrated on Correggio.
Frederick III raised their signoria to a county in 1452, and it became a principality in 1616. Because their arms matched those of the Habsburgs, they were sometimes called Correggio d'Austria. The line of rulers ended in 1635, when the Duchy of Modena seized the principality.