Poland, died following complications after giving birth her second daughter. Without legitimate male offspring, it was expected that the Polish sovereign would remarry. The Zápolya family was opposed to the Habsburgs, something that Holy Roman Emperor Maximilian I was conscious of. In order to eliminate anti-Habsburg sentiments within Poland, Maximilian I requested that Sigismund I marry a bride selected by him. Bona Maria Sforza was on the list of selected candidates. Isabella then sent her daughter's tutor Crisostomo Colonna to Vienna to look after the princess's interests. As the other candidates were ruled out for various reasons, Sigismund I finally consented to marrying Bona Maria in the spring of 1517. On 6 December 1517 Isabella participated in the marriage per procura between her daughter and the Polish King, held at Castel Capuano near Naples (for which the Duchess had to raise extra taxes in Bari to pay the expenses), in which the groom was represented by the castellan of Kalisz, Stanisław Ostroróg; many representatives of the Italian aristocracy were invited to the ceremony. The contract was signed on the day, according to which Isabella was to pay King Sigismund I 100,000 pure gold ducats, 50,000 of which would be paid shortly after Bona Maria's arrival in Poland, and the other half within the next two years. It Was also stipulated that the Duchess could no longer sell her property, which Bona Maria was to inherit after her death. Isabella also covered her daughter's travel expenses to Kraków. On 11 December, representatives from the Duchy of Bari officially recognized Bona Maria as her mother's only heir and declared themselves the princess's vassals. Due to the cold winter, Isabella postponed her daughter's trip to Poland several times. Finally, on 3 February 1518, the Duchess said goodbye to her only surviving child, who was leaving Naples to go to Wawel Castle. To commemorate her farewell to her daughter, Isabella had Bona Maria's foot carved in the stone and the inscription: Here the Polish Queen stood, when she said goodbye to Donna Isabella, her mother, the Duchess of Milan. Like her mother, Bona Maria was known for her energetic personality; she was not afraid to openly disagree with her husband and acted as a patron to artists. However, unlike Isabella, she was able to build up her own political faction in her marital homeland. Conflict over the inheritance of Joanna of Aragon, Queen of