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In page Bianca Maria Visconti:

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Her death raised suspicions; Galeazzo Maria Sforza was accused by various men, including Bartolomeo Colleoni, of having poisoned her. It is certain that during her illness, there were in Melegnano certain men close to Galeazzo, some of whom were later involved in other cases of poisoning. According to Bernardino Corio, Visconti "died of natural ungratefulness more than poison".[citation needed]