Collection includes letters, promissory notes, and other handwritten documents relative to matters between the Sfondrati family and political leaders in the region. Many of the items relate to family financial matters. Materials date from between 1531 and 1788.

Contains depositions, legal opinions, letters, and other materials from the Sfondrati family. Much of the materials deal with the inheritance of lands from Isabella di Capua, of the Cybo-Malaspina family of Massa.