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Sigismund I
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Sigismund I

grand duke of Lithuania
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Sigismund I, also known as Sigismund the Old, was King of Poland and Grand Duke of Lithuania from 1506 to 1548. He was a member of the Jagiellon dynasty, which ruled over Poland-Lithuania, Bohemia, and Hungary.12

During his reign, Sigismund I established Polish suzerainty over Ducal Prussia and incorporated the duchy of Mazovia into the Polish state. He also implemented fiscal and monetary reforms, though he often clashed with the Polish Diet over royal power. Sigismund I's reign saw military successes against the Teutonic Knights and Moldavia, securing Poland's eastern borders. He also promoted Renaissance culture in Poland and, despite being Catholic, offered religious toleration to Orthodox Christians and Jews. His son, Sigismund II Augustus, was the last Jagiellon king of Poland.13

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4 Britannica Sources
  1. Sigismund I
  2. Jagiellon dynasty
  3. Sigismund II Augustus
  4. history of Poland - Foreign affairs

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