A possession of the Abbey of San Colombano of Bobbio, it received a castle and was under the bishops of Tortona after 1157. Later it was an imperial fief under the Malaspina, who held it until 1797.
Main sights
Pieve of Santa Maria Assunta, a Romanesque edifice with a stone portal surmounted by a Romanesque lunette.
Museum of the Peasant Civilization, in the frazione of Lunassi.
The other frazione of Caldirola, elevation 1,110 metres (3,640 ft) is a ski resort.