Located centrally in Lomellina, near the right bank of the Agogna, the village belonged to the Counts of Lomello. Some of them took up residence here and therefore received a title from the place.
The feudal vassals, named thus Counts of Olevano, settled in an imposing, multi-towered castle probably built in the twelfth century, as we know that it was destroyed for the first time by Frederick Barbarossa. A second fortress was razed to the ground in 1404 by Facino Cane.