The minister disposed of, the turn of the favourite came. From being Lodovico’s ally and tool, Tassino was now become a serious hindrance to Lodovico. His arrogance was overweening. He had boundless power over Bona, and was rapidly making himself absolute master in the palace. The crisis arrived in a struggle over the Rocchetta, the inner Keep of the Castle of Milan, which, with its strong garrison and impregnable defences, gave its commander virtual dominion of the whole city. Tassino persuaded the Duchess to appoint his father as Castellan, in the place of Filippo Eustachio, who had been put in charge of it by Duke Galeazzo. But Filippo, a staunch adherent of Lodovico’s, disobeyed her repeated commands to give up the keys, and sturdily resisted all her efforts to remove him, defying her threats and sentences, until the Moro had prepared a swift and sudden stroke. One day, at Lodovico’s bidding, Filippo and Gio. Francesco Pallavicino entered the apartments of the little Duke, at an hour when most of his attendants were out of the way, and snatching up the child, carried him across the narrow bridge which led from the Corte Ducale into the Rocchetta, and delivered him into the custody of his uncle. With the person of the sovereign in his possession, behind the defence of drawbridges, portcullises and artillery, and a strong body of soldiers faithful to himself, the Moro could dictate terms to the Duchess. She had no alternative but to surrender to him the regency and the guardianship of her son. As for Tassino, seeing himself overreached, he fled incontinently, to escape a worse fate, and stripped of everything but his perfumes and ivory combs, which were bundled after him, he disappears ignobly out of history. Bereft at once of lover, son and sovereignty, Bona was a piteous figure of helpless rage and grief. She declared she would abandon the Duchy, even if she had to climb out of the windows and cross the moat at the risk of her life. Lodovico, however, gently detained her in the Castle of Abbiategrasso, a virtual prisoner, until the subsidence of her shallow passion enabled her to submit to the new order of things and settle down, without power or authority, to a quiet life with her children, in the Castello of Milan again.