The origins of the Shrine of Madonna della Ceriola date back around the mid-5th century when Saint Vigilio, bishop of Brescia, introduced Christianity into the Lake Iseo area, thereby abolishing the worship of the pagan goddess Isis and spreading the faith in Jesus Christ and the Virgin Mary.
Saint Vigilio built a small chapel on the top of the island and dedicated it to the Virgin Mary as a symbol of purification from pagan superstitions and of the new light of Christianity. This small church was the first parish church of the island and was called Santa Maria de curis, as shown in the list of possessions of the Diocese of Brescia, which dates back to 1410. It was also the first church of the lake to be dedicated to the Virgin Mary. Later it was named Madonna della Ceriola, probably after the image of the Virgin (12th century) carved in a stump of cerro (Turkey oak). The Virgin was depicted seated on a throne, wearing a wide mantle and holding Baby Jesus.
Present-day building was fulfilled in the 16th century, but its inner part was modified the following century by the insertion of a new chancel. The bell tower was built in 1750.
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.