The first record of a defensive structure in Solza refers to a battle, which took place in 1404, in which the fortress is the backdrop of a struggle between the Guelfi and Ghibellini.
The castle, however, is best known for being the birthplace of Bartolomeo Colleoni. According to history, he left Castello Solza at around 14 to 15 years old. Nothing foretold that he was destined to become one of the most notorious leaders of the fifteenth century.
The manor is four-sided, set on a slight slope overlooking the river bed of the Adda, surrounded by a small village, but, nevertheless, independent and separate.
The complex consists of the remains of a tower and a wall which encloses the courtyard, in which there are some buildings.
It is one of the many historical sites that dot the island. Right along the river Adda lies evidence of two great powers pitted against each other long ago, the Duchy of Milan and the Republic of Venice.