The nephews were furious and convinced the pope to punish the Duke by banning grain shipments originating in Castro from being distributed in Rome and the surrounding territory, thereby depriving the Duke of an important source of income. Duke Odoardo's Roman creditors saw their chance - the Duke was unable to pay his debts, which he had accumulated in military adventures against the Spanish in Milan and in luxurious living. The unpaid and unhappy creditors sought relief from the pope, who turned to military action in an attempt to force payment.