He was born in Drużbin, Poddębice County, Poland. In 1626, Jakub Zadzik was instrumental in convincing the
Sejm in
Toruń to increase taxes in order to generate funds for the war against Sweden and to create a commission for reformation of the military treasury. He negotiated the
Treaty of Altmark in 1629 and the
Treaty of Sztumska Wieś in 1635 with Sweden, which ended the
Polish-Swedish War, and the
Treaty of Polanów with
Russia in 1634, ending the
Smolensk War. He was a dedicated
Catholic and a supporter of the
Counter-Reformation. In 1638 he succeeded in closing the
Polish Brethren center in
Raków. He often opposed
Władysław IV Waza, especially his actions designed to regain the throne of
Sweden and strengthen the powers of the
monarchy by means of military action. Zadzik sponsored the
Cracow Bishops' Palace in Kielce, now a
museum. ==Bibliography==