a favoured mistress seemed dashed. Marriage In 1578, Joanna died; a few months later Francesco secretly married Bianca, and on 10 June 1579, the marriage was publicly announced, and Antonio acknowledged as the Duke's son. Two days later, on 12 June, Bianca was crowned the Grand Duchess of Tuscany at the Palazzo Vecchio in Florence. The Venetian government now put aside its resentment and was officially represented at the magnificent wedding festivities, for it saw in Bianca Cappello an instrument for cementing good relations with Tuscany. Bianca's position, however, was still not secure. The heir remained the young Grand Prince Philip; her own son by Francesco, though acknowledged, remained illegitimate, barred from inheriting the duchy. There would be no more children born of the relationship, and Bianca was aware that, if her husband were to die before her, she was lost, for his family, especially his brother Cardinal Ferdinand, hated her bitterly, as an adventuress and interloper. In 1582, however, Grand Prince Philip died. Francesco immediately began working on securing the succession for his remaining son, Antonio, having him legitimated and declared heir apparent, with the support of Philip II of Spain. As the mother of the heir, Bianca's position was far stronger: even if Francesco died before Antonio reached adulthood, Bianca would have a good claim to ruling as regent on her son's behalf, and her husband's family would give her more respect as the mother of the heir. In October 1587, at the Villa Medici in Poggio a Caiano, Francesco and Bianca died on 19 and 20 October, possibly poisoned, or as some historians believe, from malarial fever. As Bianca wasn't an official member of the Medici family, Cardinal Ferdinand did not allow her to be buried in the Medici family tombs. Instead, some believe that Bianca was buried in an unmarked mass grave under the church of St. Lorenzo, having been brought back to Florence from Poggio a Caiano. In 2006, forensic and toxicology experts at the University of Florence reported evidence of arsenic poisoning in a study published in the British Medical Journal, but in 2010 evidence of the parasite Plasmodium falciparum, which causes malaria, was found in Francesco's remains. Depictions The biography of Bianca Cappello was used by Thomas Middleton for his tragedy Women Beware Women (published 1657). References Sources James Chater, "Bianca Cappello and Music", in Renaissance Studies in Honor of Craig Hugh Smyth