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.
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The title of count was created in 1406 for Guido Torelli: the Torelli family ruled Guastalla until 1539, when it was purchased by Ferrante Gonzaga, while another branch held the County of Montechiarugolo, which was created from a split in the county in 1456, until 1612.