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In page Vittoria Accoramboni:

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But her good fortune aroused much jealousy, and attempts were made to annul the marriage (in particular, Pope Gregory XIII was opposed to it); she was imprisoned in the Castel Sant'Angelo and only liberated due to public pressure[1] and through the intervention of Cardinal Carlo Borromeo.[citation needed] On the death of Gregory XIII, Cardinal Montalto, her first husband's uncle, was elected in his place as Pope Sixtus V (1585); he vowed vengeance on the duke of Bracciano and Vittoria, who, warned in time, fled first to Venice and thence to Salò in Venetian territory.[1] Here the duke died in November 1585, bequeathing to his widow all his personal property. The duchy of Bracciano passed to his son by his first wife.