The wedding and coronation took place on 18 April 1518, but celebrations continued for a week. Almost from the beginning of her life in Poland, the energetic queen tried to gain a strong political position and began forming a circle of supporters. On 23 January 1519,
Pope Leo X, whom Bona had friendly relationship with from her Italian days, granted her the privilege of awarding eight
benefices in five Polish cathedrals (
Kraków,
Gniezno,
Poznań,
Włocławek, and
Frombork). In May 1519, the privilege was expanded to fifteen benefices. This was a very important privilege that allowed her to secure support of various officials. Three of her most trusted supporters,
Piotr Kmita Sobieński,
Andrzej Krzycki, and
Piotr Gamrat, were sometimes known as the Triumvirate. She became openly involved in various state affairs, which did not agree with the traditional ideal of a royal wife to use discreet manipulation in government. Although the royal couple disagreed on many domestic and foreign issues, the marriage was a supportive and successful partnership.
Accident in Niepołomice During the first decade of her marriage, Bona gave birth to six children. While pregnant with the youngest, reportedly in the fifth month of gestation, the Queen injured herself during an escape on horseback at a bear hunt in
Niepołomice Forest and gave birth prematurely. Historian Małgorzata Duczmal speculates that the pregnancy could have been more advanced, given that the child was born alive and did not die immediately. The Prince was baptized and given a name that presumably was Albertus, though he is also referred to in texts as "Adalbertus", as those two names were sometimes used interchangeably in the 16th century.
Domestic policy in 1537'' by
Henryk Rodakowski. Seated Sigismund is accompanied by his wife Bona Sforza and royal court whilst being surrounded by an angry mob at
Lwów High Castle. Believing that one of the most important things needed for strengthening royal authority was appropriate
revenue, Bona sought to assemble as much dynastic wealth as possible, which would give her husband's financial independence to defend the kingdom from external threats without the Parliament's slow support. The royal family gained numerous estates in
Lithuania and finally took over the Grand Duchy by 1536–1546. She helped to reform agriculture
taxation, including
uniform duties on the peasants and area measurements. Those actions generated huge
profits. Wanting to ensure the continuity of the Jagiellonian dynasty on the Polish throne, the royal couple decided to make the nobles and magnates to recognise their only surviving son, the minor Sigismund Augustus, as heir to the throne. First, the Lithuanian nobles gave him the ducal throne in October 1529 and December of the same year he was declared king; he was crowned
Sigismund II Augustus in February 1530. This led to huge opposition from Polish lords, which led to the adoption of the bill that the next coronation would take place after the death of Sigismund Augustus and only with the consent of all the noble brothers. In 1539, Bona reluctantly presided over the burning of the 80-year-old
Katarzyna Weiglowa for heresy, but that event ushered in an era of tolerance. The Queen's confessor,
Francesco Lismanini, assisted in the establishment of a Calvinist Academy in
Pińczów.
Foreign policy Bona was instrumental in establishing alliances for Poland, but she was rumored to be a notorious conspirator because of her gender and Italian heritage. In addition to her good relationships with the Vatican, she sought to maintain good relations with the
Ottoman Empire and had contacts with
Hürrem Sultan, chief consort of
Suleiman the Magnificent. It is believed that the good relationship between the Queens saved Poland from being attacked by the Ottoman Army during the
Italian Wars. Worried about the growing ties between the Habsburgs and Russia by 1524, Sigismund signed a Franco-Polish alliance with King
Francis I of France to avoid a possible
two-front war. Bona was instrumental in establishing an alliance between Poland and France with the objective of recovering Milan. The negotiations came to an end, and the alliance was disbanded after Francis' troops were defeated by
Charles V at the
Battle of Pavia in 1525. Despite their blood relation, Bona sometimes was a fierce opponent of the Habsburgs. She advocated attaching
Silesia to the Polish crown in return for her hereditary principalities of Bari and Rossano, but Sigismund the Old did not fully support this idea. Wanting to secure her eldest daughter in the Kingdom of Hungary, Bona successfully supported her son-in-law
John Zápolya as successor against Ferdinand of Habsburg after
Louis II of Hungary was killed at
Mohács in 1526. In 1537, Bona Sforza established a settlement at
Bar in what is now
Ukraine.
Artistic patronage Alongside her husband's profound interest in the revival of classical antiquity, Bona was instrumental in developing the
Polish Renaissance. She brought renowned Italian artists, architects and sculptors from her native country. Her most known artistic involvement were the expansion of the
Palace of the Grand Dukes of Lithuania in
Vilnius and the construction of
Ujazdów Castle, which included a large park and a menagerie. The plans were prepared by
Bartolomeo Berrecci da Pontassieve, who designed several other projects in Poland. ==Queen Mother==