That was a decision of the Spanish government, which, in search of new funds to replenish the always troubled state coffers, in 1647 had decided to sell certain areas as a fiefdom to a Milanese and Spanish aristocratic family, leaving the centers included in the area itself the possibility of redeeming themselves against the payment of money.
The Spanish government's decision in 1647 to sell certain areas as fiefdoms was driven by their need for financial resources. The sale granted ownership rights to a Milanese and Spanish aristocratic family, while allowing those centers within the designated region to redeem themselves through payment of money.