Sigismund II Augustus (1520 – 1572), King of Poland and Grand Duke Sigismund III of Lithuania
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Sigismund Kęstutaitis (ca. 1365 - 1440), Grand Duke Sigismund I of Lithuania
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Sigismund III Vasa (1566 – 1632 N.S.), head of the Polish-Lithuanian Commonwealth
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Sigismund I the Old of Poland (1467 – 1548), who was also Grand Duke Sigismund II of Lithuania
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