Not from Piacenza, but Enna province in central Sicily; they say this strong cheese made exclusively from the milk of Sicilian sheep, with its saffron stamens and black peppercorns, was first made for King Roger back in Norman times. He was depressed; his wife, Queen Adelasia, invited the local cheese-makers to the palace and asked if they could invent a saffron infused pecorino to cheer him up.
Often spelled piancentinu.
Image by ilcavalcatore