The Castello di Frascarolo (Frascarolo castle) or of Medici of Marignano is on the hill on a dominating position between Ganna and Ceresio valleys.
It is believed the castle is from the early Middle Ages, perhaps the work of the Longobards, but it’s only documented in 1160 when Archbishop of Milan Oberto da Pirovano upheld a valid resistance to the advancing inhabitants of Como looking to conquer the Varese area. However, it’s possible that the castle was only a rural fort back then.
Starting in the 12th century, it was the property of the Abbey of Ganna (or Abbey of San Gemolo in Ganna Valley), and followed destiny and plunders including the one by the Swiss Unterwalden from Mendrisio in 1511; it was purchased by Marquis of Marignano Gian Battista Medici in 1543. It was precisely with the advent of the noble Medici family that the castle was renovated and embellished. Over the centuries, it lost its defensive physiognomy to become a typical 16th-century residence.
The castle and its massive walls flaunt a mighty 15th-century tower with a rusticated portal, courtyard with a loggia, and an adjacent section built in the 16th century when it became an exclusive dwelling. The entrance hall preceded by a boulevard and large stretches of meadow inside certainly belong to another period.
The castle is still private property and cannot be toured without specific permission.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.