In 1628 the podestà of Brescia, the Venetian patrician Domenico Ruzzini, asked the town-council
for permission to study the Liber potheris, a thirteenth-century cartulary collecting the oldest
documents of the municipality. Ruzzini looked for a medieval treaty between the emperor Frederic
II and the communes of the second Lombard League (1232), which is copied in the Liber potheris.
Ruzzini’s aim was both historical scholarship and political interest: the knowledge of the traditional
rights, possessions and privilege of the city clergy and institutions was important for his government.