Built at the end of the 12th century by the Belcredi to defend themselves from attacks by the Piacenza people, it reinforced the Montalto Castle, which stood on the highest hill.

Over the centuries, it suffered several attacks and was assigned by the Sforza to various Piacenza families. With the Spanish domination, it then returned to the Belcredi.

The descendants of the same renovated the fortified house at the beginning of the 18th century and transformed it into an accurate manor with a crenellated tower (open to visitors), a Gothic-inspired entrance and an elegant wall structure with loggias and recesses.

Only the perimeter bases of the basements remain from the medieval period.

Inside, valuable works of art are preserved, including many 18th-century paintings and a marble staircase that dominates the atrium.

Also worthy of note is the chapel inside the structure, which preserves a precious altarpiece and ancient liturgical books.

Today, the castle of Mornico Losana is closed to the public and only opens on certain occasions, such as FAI Days, weddings, or corporate events.

Mornico is mentioned among the fortified places that emperor Frederick I granted to the city of Pavia in 1164, all with autonomous administration.

It was included by the Pavesi in the pedestrian or squad of Montalto, enfeoffed to the Belcredi (an aristocratic family of the Ghibelline party of Pavia), who built or more probably rebuilt the castleç

The Strozzi, the Taverna and the definitive return to the Belcredi, with the Spanish domination, who in the 18th century also took the title of Marquises of Mornico, maintained possession until the first half of the 19th century, transforming the fortified village into a manor. At the beginning of the 19th century, the castle became the property of the Marquis Doria, then to those of the Brignole. In 1880, the castle passed into the hands of the De Filippi, who subsequently sold it to Professor Lorini.