Bona Sforza (February 2, 1494–November 19, 1557) was the wife of Sigismund I the Old (1467–1548), King of Poland, Grand Duke of Lithuania, Ruthenia, and Samogitia. She was born into the family of Gian Galeazzo Sforza, Duke of Milan (1469–1494), and Isabella of Aragon (1470–1524). In April 1502, her mother, Isabella, together with her only surviving daughter, settled in the Norman-Swabian castle in Bari, where Bona began her education. Her tutors included Italian humanists Crisostomo Colonna and Antonio de Ferraris, who taught Latin, classical literature, mathematics, history, law, natural sciences, theology, and geography. She mastered several musical instruments. After the death of the first wife of Polish King Sigismund I, Barbara Zápolya, Charles V betrothed Bona to Sigismund. On December 6, 1517, the engagement took place in Naples, and on April 18, 1518, the wedding and coronation took place with King Sigismund I. The marriage produced two sons and four daughters: Isabella (1519–1559), wife of John Zápolya (János Zápolya) (1487–1540), King of Hungary (1527–1540) and Prince of Transylvania; Sigismund Augustus (1520–1572), Grand Duke of Lithuania, King of Poland, head of the federal state of the Polish-Lithuanian Commonwealth; Sophia (1522–1575), wife of Henry V, Duke of Brunswick-Wolfenbüttel (1489–1568); Anna (1523–1596), Queen of Poland, wife of Stephen Báthory, Prince of Transylvania and King of Poland (1576–1586); Catherine (1526–1583), from 1562 the first wife of John III Vasa (1537–1592), King of Sweden (1568–1592), Duke of Finland (from 1556); Wojciech-Albrecht (1527), stillborn. From the very beginning of her stay in Poland, Queen Bona sought to establish a strong political position, created her own party, and at the same time strengthened her influence on the king. During the lifetime of Sigismund I, she secured the election and coronation of 10-year-old Sigismund II Augustus as king. After the death of Sigismund I (1548), Sigismund II Augustus fought against his ambitious mother. Bona Sforza had plans to unite almost all of Europe under her rule through the dynastic marriages of her children. Due to her poor relationship with her son, she intended to leave the country. After renouncing her numerous possessions, the king agreed to her departure. In 1556, she left the Polish-Lithuanian Commonwealth. On November 17, 1557, a will was drawn up. She died in her principality in Bari, Italy, according to one version, from poisoning by her own doctor on the orders of the Habsburgs. She was buried in the Basilica of St. Nicholas in Bari, and in 1593, her daughter Anna had a marble tomb erected at her expense.